Map of the source code - Revs on the BBC Micro

This page contains a map of all the routines and variables in the original version of Revs, in the order in which they appear in the original source. The source files are structured like this:

The main game source, which consists of Workspaces, Revs A, Revs B, Revs C, Revs D, Revs E, Revs F, Revs G, Revs H and Revs I
The track data files for Silverstone, Brands Hatch, Donington Park, Oulton Park, Snetterton and the Nürburgring

You can click on the links above to jump to the relevant part of the map.

Workspaces
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Category	Details
Workspaces	Workspace: Zero page Mainly temporary variables that are used a lot
Workspaces	Workspace: Stack variables Variables that share page 1 with the stack
Workspaces	Workspace: Main variable workspace The main block of game variables

Revs A
------

Category	Details
Setup	Subroutine: Entry The main entry point for the game: move code into upper memory and call it
Setup	Subroutine: SwapCode Move the track data to the right place and run a checksum on it
Setup	Subroutine: MoveCode Move and reset various blocks around in memory
Setup	Variable: ldaZero Contains code that's used for modifying the MoveCode routine
Setup	Variable: blockStartLo Low byte of the start address of blocks moved by the MoveCode routine
Setup	Variable: blockStartHi High byte of the start address of blocks moved by the MoveCode routine
Setup	Variable: blockEndLo Low byte of the end address of blocks moved by the MoveCode routine
Setup	Variable: blockEndHi High byte of the end address of blocks moved by the MoveCode routine
Setup	Variable: blockToLo Low byte of the destination address of blocks moved by the MoveCode routine
Setup	Variable: blockToHi High byte of the destination address of blocks moved by the MoveCode routine
Sound	Variable: soundData OSWORD blocks for making the various game sounds
Sound	Variable: envelopeData Data for the sound envelope for squealing tyres
Sound	Variable: xStoreSound Temporary storage for X so it can be preserved through calls to the sound routines
Sound	Subroutine: MakeSound Make a sound
Sound	Subroutine: DefineEnvelope Define a sound envelope
Sound	Subroutine: MakeSoundEnvelope Either make a sound or set up an envelope
Driving model	Subroutine: ScaleWingSettings Scale the wing settings and calculate the wing balance, for use in the driving model
Driving model	Variable: wingScaleFactor Scale factors for the wing settings
Track geometry	Subroutine: SpinTrackSection Apply spin to a section in the track section list
Maths (Geometry)	Subroutine: AddVectors Add two three-axis vectors together
Maths (Arithmetic)	Subroutine: Multiply8x8 Calculate (A T) = T * U
Maths (Arithmetic)	Subroutine: Divide8x8 Calculate T = 256 * A / V
3D objects	Subroutine: GetObjectDistance Calculate the distance between an object and the player's car, for collision purposes
Maths (Geometry)	Subroutine: GetRotationMatrix (Part 1 of 5) Calculate the rotation matrix for rotating the player's yaw angle into the global 3D coordinate system
Maths (Geometry)	Subroutine: GetRotationMatrix (Part 2 of 5) Calculate sin(H G) for smaller angles
Maths (Geometry)	Subroutine: GetRotationMatrix (Part 3 of 5) Calculate sin(H G) for bigger angles
Maths (Geometry)	Subroutine: GetRotationMatrix (Part 4 of 5) Loop back to calculate cos instead of sin
Maths (Geometry)	Subroutine: GetRotationMatrix (Part 5 of 5) Apply the correct signs to the result
Maths (Geometry)	Subroutine: GetAngleInRadians Convert a 16-bit angle into radians, restricted to a quarter circle
Maths (Arithmetic)	Subroutine: Multiply8x16 Multiply an 8-bit and a 16-bit number
Maths (Arithmetic)	Subroutine: Multiply16x16 Multiply a sign-magnitude 16-bit number and a signed 16-bit number
Maths (Arithmetic)	Subroutine: Absolute16Bit Calculate the absolute value (modulus) of a 16-bit number
Maths (Arithmetic)	Subroutine: Negate16Bit Negate a 16-bit number
Keyboard	Subroutine: ScanKeyboard Scan the keyboard for a specific key press
Sound	Subroutine: FlushSoundBuffer Flush the specified sound buffer
Sound	Subroutine: MakeDrivingSounds Make the relevant sounds for the engine and tyres
Keyboard	Subroutine: ProcessShiftedKeys Check for shifted keys (i.e. those that need SHIFT holding down to trigger) and process them accordingly
Drivers	Subroutine: SortDrivers Create a sorted list of driver numbers, ordered as specified
Drivers	Subroutine: UpdateLapTimers Update the lap timers and display timer-related messages at the top of the screen
Car geometry	Subroutine: PlaceCarsOnTrack Position the cars on the track, ready for a race or qualifying lap
Car geometry	Subroutine: CheckForCrash Check to see if we have crashed into the fence, and if so, display the fence and make the crash sound
Main loop	Subroutine: FinishRace Continue running the race until all the non-player drivers have finished and we have a result
Car geometry	Subroutine: PushCarOffTrack Push a car off the track and out of the race
Drivers	Subroutine: ClearTotalRaceTime Clear a specified driver's total race time following the end of an incomplete race
3D objects	Subroutine: BuildPlayerCar Build the objects for the player's car
Track geometry	Subroutine: GetSectionCoord Copy a three-part 16-bit coordinate from the track section data
Track geometry	Subroutine: GetSectionCoords Copy two three-part 16-bit coordinates from the track section data
Track geometry	Subroutine: CopySectionData Copy a 16-bit y-coordinate from the track section data
Track geometry	Subroutine: GetPlayerIndex Set the index for the player's segment in the track section buffer to be 32 segments behind the front segment
Track geometry	Subroutine: GetFirstSegment Get the track section coordinates and flags from the track data and populate the first track segment
Track geometry	Subroutine: ShuffleSectionList Shuffle the track section list along by one position
Track geometry	Subroutine: IncSectionPointers Increment the track section list pointers following a shuffle
Track geometry	Subroutine: SetSectionPointers Set the track section list pointer to a specific value and update the validity pointer accordingly
Car geometry	Subroutine: MovePlayerForward Move the player's car forwards by one track segment and add the segment to the track segment buffer
Track geometry	Subroutine: GetTrackSegment (Part 1 of 3) Set up the next track segment in the track segment buffer
Track geometry	Subroutine: GetTrackSegment (Part 2 of 3) Set the flags for the new front segment in the track segment buffer
Track geometry	Subroutine: GetTrackSegment (Part 3 of 3) Set the inner and outer track coordinates for the new track segment
Track geometry	Subroutine: UpdateCurveVector Move to the next segment vector along in the direction we are facing, but only for curved track sections
Track geometry	Subroutine: UpdateVectorNumber Move to the next segment vector along the track in the direction we are facing
Car geometry	Subroutine: ChangeDirection Update the track segment buffer when the player's car spins so it changes the direction in which it is facing along the track
Car geometry	Subroutine: MovePlayerBack Move the player's car backwards by one track segment and update the track segment buffer
Car geometry	Subroutine: TurnPlayerAround Turn the player around and initialise the specified number of track segments in the new direction
Car geometry	Subroutine: MovePlayer Move the player's car forwards or backwards by one segment
Track geometry	Subroutine: GetSegmentVector Fetch a segment vector from the track data file
3D objects	Subroutine: MoveObjectForward Move a specified object forwards along the track by one segment
3D objects	Subroutine: MoveObjectBack Move a specified object backwards along the track by one segment
Tactics	Subroutine: GetSegmentSteering Calculate the optimum steering to take for the current track segment
Keyboard	Subroutine: ProcessDrivingKeys (Part 1 of 6) Process joystick steering
Keyboard	Subroutine: ProcessDrivingKeys (Part 2 of 6) Process keyboard steering
Keyboard	Subroutine: ProcessDrivingKeys (Part 3 of 6) Process joystick brake and throttle
Keyboard	Subroutine: ProcessDrivingKeys (Part 4 of 6) Process keyboard brake and throttle
Keyboard	Subroutine: ProcessDrivingKeys (Part 5 of 6) Process joystick gear change
Keyboard	Subroutine: ProcessDrivingKeys (Part 6 of 6) Process keyboard gear change

Revs B
------

Category	Details
Main loop	Subroutine: MainDrivingLoop (Part 1 of 5) Main driving loop: Switch to the track and start the main loop
Main loop	Subroutine: MainDrivingLoop (Part 2 of 5) Main driving loop: The body of the main loop
Main loop	Subroutine: MainDrivingLoop (Part 3 of 5) Main driving loop: Process rejoining the race or lap after a crash
Main loop	Subroutine: MainDrivingLoop (Part 4 of 5) Main driving loop: Leave the track
Main loop	Subroutine: MainDrivingLoop (Part 5 of 5) Main driving loop: Process driving keys, potentially leaving the track, and loop back to part 2
Drivers	Subroutine: AddTimeToTimer Add time to the specified timer
Text	Subroutine: PrintSecondLineGap Prints a text token on the second text line at the top of the driving screen, with an empty gap on the line above
Main Loop	Subroutine: ResetVariables Reset a number of variables for driving, and print the top two text lines
Screen buffer	Subroutine: SetBackground Set the background colour for any track lines that have not yet had a background colour set
Screen buffer	Subroutine: CopyDashData Copy the dash data from the main game code to screen memory, and vice versa
Screen buffer	Variable: dashDataAddress Addresses for copying the first block of dash data between the main game code and screen memory
Drawing the track	Subroutine: CheckVergeOnScreen Check whether a verge coordinate is on-screen
Drawing the track	Subroutine: MapSegmentsToLines Map verges in the track segment list to track lines in the track view
Drawing the track	Subroutine: DrawVergeEdge Draw one of the four track verge edges into the screen buffer
Drawing the track	Subroutine: DrawTrack Draw the track into the screen buffer
Drawing the track	Subroutine: SetVergeBackground Update the background colour table for any verges that overlap the left edge of the screen
Drawing objects	Subroutine: DrawCornerMarkers Draw any visible corner markers
Text	Subroutine: UpdatePositionInfo Apply any position changes and update the position information at the top of the screen
Car geometry	Subroutine: ProcessContact Process collisions between the player and the other cars
Driving model	Subroutine: SquealTyres Make the tyres squeal
Drawing objects	Subroutine: DrawObjectEdge (Part 1 of 5) Draw the specified edge of an object part
Drawing objects	Subroutine: DrawObjectEdge (Part 2 of 5) Calculate the screen address for the edge we want to draw
Drawing objects	Subroutine: DrawObjectEdge (Part 3 of 5) Construct a pixel byte for the edge we want to draw
Drawing objects	Subroutine: DrawObjectEdge (Part 4 of 5) Draw the edge into the screen buffer, merging with any content already in the buffer
Drawing objects	Subroutine: DrawObjectEdge (Part 5 of 5) Fill the object if required and loop back for the next edge
Dashboard	Subroutine: GetTyreDashEdge Copy the pixel bytes along the tyre and dashboard edges so they can be feathered
Drawing objects	Subroutine: FillAfterObject Fill the block to the right of an object
Dashboard	Subroutine: GetTyreDashEdgeSup Copy the pixel bytes along the tyre and dashboard edges so they can be feathered
Drawing objects	Subroutine: FillAfterObjectSup Fill the block to the right of an object
Drawing objects	Subroutine: DrawEdge Draw an edge, overwriting whatever is already on-screen
Dashboard	Subroutine: GetTyreDashEdges Fetch the pixel bytes from along the edge of the dashboard or tyre and fill the block to the right of the edge appropriately
Dashboard	Subroutine: CopyTyreDashEdges Fetch the pixel bytes from the right edge of the left tyre and the right edge of the dashboard, and fill to the right of the edge
Drawing objects	Subroutine: FillInsideObject Fill the object part from the previous edge to the current edge

Revs C
------

Category	Details
Screen buffer	Subroutine: GetColour (Part 1 of 3) Calculate the colour of a specific pixel byte in the screen buffer
Screen buffer	Subroutine: GetColour (Part 2 of 3) Process the left verge
Screen buffer	Subroutine: GetColour (Part 3 of 3) Process the right verge
Screen buffer	Subroutine: SetMarker Insert a marker value into a dash data block
Screen buffer	Subroutine: GetColourSup Calculate the colour of a specific pixel byte in the screen buffer
Tactics	Subroutine: AssistSteering Apply computer assisted steering (CAS) when configured
Keyboard	Subroutine: SetSteeringLimit Apply a maximum limit to the amount of steering
Car geometry	Subroutine: SetPlayerDriftSup Record player drift, but only if the player is not in the first three segments of a track section
Drawing objects	Subroutine: DrawObject Draw an object of a specific type
Drawing objects	Subroutine: ScaleObject Scale an object's scaffold by the scale factors in scaleUp and scaleDown
Drawing objects	Subroutine: DrawObjectEdges Draw all the parts of an object by drawing edges into the screen buffer
3D objects	Subroutine: GetObjYawAngle (Part 1 of 4) Calculate an object's yaw angle
3D objects	Subroutine: GetObjYawAngle (Part 2 of 4) Calculate yaw angle for when \|x-delta\| > \|z-delta\|
3D objects	Subroutine: GetObjYawAngle (Part 3 of 4) Calculate yaw angle for when \|x-delta\| = \|z-delta\|
3D objects	Subroutine: GetObjYawAngle (Part 4 of 4) Calculate yaw angle for when \|x-delta\| < \|z-delta\|
3D objects	Subroutine: GetObjPitchAngle Calculate an object's pitch angle
Track geometry	Subroutine: GetSectionAngles (Part 1 of 3) Get the yaw and pitch angles for the inner and outer track sections
Track geometry	Subroutine: GetSectionAngles (Part 2 of 3) Calculate the track section number for this track section entry
Track geometry	Subroutine: GetSectionAngles (Part 3 of 3) Calculate the yaw and pitch angles for the track section entry that we want to update
Track geometry	Subroutine: GetSegmentYawAngle Calculate the difference in yaw angle between a track segment and the player
Track geometry	Subroutine: GetSectionYawAngle Calculate the difference in yaw angle between an object and the player
Track geometry	Subroutine: GetSegmentAngles (Part 1 of 3) Get the yaw and pitch angles for the inner or outer track segments
Track geometry	Subroutine: GetSegmentAngles (Part 2 of 3) Process a segment that is not visible by trying to process a segment that's one-quarter of the size
Track geometry	Subroutine: GetSegmentAngles (Part 3 of 3) Process a visible segment
Car geometry	Subroutine: MovePlayerSegment Move the player's car in the correct direction
Track geometry	Subroutine: GetTrackAndMarkers Calculate the 3D coordinates of the track and corner markers
Track geometry	Subroutine: GetSegmentDetails Get the details for the segment in front or behind
Track geometry	Subroutine: GetVergeAndMarkers (Part 1 of 4) Get the details for a segment's corner markers and verge marks
Track geometry	Subroutine: GetVergeAndMarkers (Part 2 of 4) Calculate the segment's verge width and outside verge coordinates
Track geometry	Subroutine: GetVergeAndMarkers (Part 3 of 4) Process the segment's corner markers
Track geometry	Subroutine: GetVergeAndMarkers (Part 4 of 4) Store details of the segment's verge marks
Car geometry	Subroutine: HideAllCars Set all the cars to hidden
Main loop	Subroutine: Delay Delay for a specified number of loops
Car geometry	Subroutine: MoveAndDrawCars Move the cars around the track and draw any that are visible, up to a maximum of five
Drivers	Subroutine: SwapDriverPosition Swap the position for two drivers (i.e. overtake)

Revs D
------

Category	Details
Tactics	Subroutine: ProcessOvertaking (Part 1 of 3) Process all cars for overtaking manoeuvres, checking first to see if the car has just finished overtaking the car in front
Tactics	Subroutine: ProcessOvertaking (Part 2 of 3) The car we are processing has not overtaken the car in front of it, so if applicable, we can keep manoeuvring into position
Tactics	Subroutine: ProcessOvertaking (Part 3 of 3) Update the car status (if configured) and loop back for the next car
Car geometry	Subroutine: CompareCarSegments Calculate the distance between two cars, in terms of segments and progress with the current segment
3D objects	Subroutine: CompareSegments Calculate the distance between two objects, in terms of the difference in their segment numbers
Car geometry	Subroutine: MoveCars (Part 1 of 2) Move the cars around the track
Car geometry	Subroutine: MoveCars (Part 2 of 2) Move the cars forward around the track, and apply steering
3D objects	Subroutine: BuildVisibleCar Check the distance to the specified car and build the car object if it is close enough
3D objects	Subroutine: BuildCarObjects (Part 1 of 3) Calculate the 3D coordinate of the specified car
3D objects	Subroutine: BuildCarObjects (Part 2 of 3) Add the racing line to the 3D coordinate of the specified car
3D objects	Subroutine: BuildCarObjects (Part 3 of 3) Calculate the screen coordinates of all the objects in the specified car
3D objects	Subroutine: GetObjectAngles Calculate the object's yaw and pitch angles, and set the object's visibility, scale and type
3D objects	Subroutine: SetObjectDetails Set an object's visibility, scale and type
3D objects	Subroutine: HideObject Set an object to be hidden
3D objects	Subroutine: SetObjectStatus Set an object's status byte
Car geometry	Subroutine: CheckForContact Check to see if the object is close enough to the player car to make contact
Drawing objects	Subroutine: DrawCarInPosition Draw the car in a specified race position
Drawing objects	Subroutine: DrawCarOrSign Draw a car or sign
Maths (Geometry)	Subroutine: HalveCoordinate Halve a coordinate with three 16-bit axes
Drawing the track	Variable: vergeTableHi High bytes of the addresses of the four verge tables
Drawing the track	Variable: vergeTableLo Low bytes of the addresses of the four verge tables
Drawing the track	Subroutine: DrawSegmentEdge (Part 1 of 7) Draw a single segment's edge as part of a whole track verge edge
Drawing the track	Subroutine: DrawSegmentEdge (Part 2 of 7) Set up the edge's gradient
Drawing the track	Subroutine: DrawSegmentEdge (Part 3 of 7) Modify the drawing routines according to the edge gradient
Drawing the track	Subroutine: DrawSegmentEdge (Part 4 of 7) Set variables to use when updating the background colour
Drawing the track	Subroutine: DrawSegmentEdge (Part 5 of 7) Calculate the dash data block and screen addresses for the edge
Drawing the track	Subroutine: DrawSegmentEdge (Part 6 of 7) Calculate the dash data block for the edge
Drawing the track	Subroutine: DrawSegmentEdge (Part 7 of 7) Save the angles for the next call to DrawSegmentEdge and return from the subroutine
Drawing the track	Subroutine: DrawShallowToRight Draw a verge edge with a shallow gradient from left to right
Drawing the track	Subroutine: DrawShallowToLeft Draw a verge edge with a shallow gradient from right to left
Drawing the track	Subroutine: DrawSteepToRight Draw a verge edge with a steep gradient from left to right
Drawing the track	Subroutine: DrawSteepToLeft Draw a verge edge with a steep gradient from right to left
Drawing the track	Subroutine: UpdateBackground Update the background colour table for when we draw a verge edge off the left edge of the screen
Drawing the track	Subroutine: DrawVergeByteLeft Draw two bytes into the screen buffer in the first and second dash data blocks for the edge
Drawing the track	Subroutine: StopDrawingEdge Stop drawing the current segment's verge edge
Drawing the track	Subroutine: DrawVergeByteRight Draw two bytes into the screen buffer in the second and third dash data blocks for the edge
Drawing the track	Subroutine: DrawGrassRight Draw a green byte into the screen buffer in the second dash data block for the edge
Drawing the track	Subroutine: DrawGrassLeft Draw a green byte into the screen buffer in the first dash data block for the edge
Screen buffer	Subroutine: CheckDashData Check whether a dash data block index is pointing to dash data

Revs E
------

Category	Details
Text	Variable: token26 Text for recursive token 26
Text	Variable: token4 Text for recursive token 4
Screen buffer	Variable: dashData0 Contains code that gets moved into screen memory
Dashboard	Variable: tyreEdgeIndex Index of the mask and pixel bytes for the tyre edges on a specific track line
Track geometry	Variable: segmentFlagMask A mask for extracting bits from the segment flag byte when processing the track verge and corner markers
Track geometry	Variable: vergeColour Lookup table for converting bits 0-2 of the segment flag byte into the verge colour scheme
Track geometry	Variable: vergeScale Scale factors for the track verge width for different types of verge (larger value = smaller verge width)
Screen buffer	Variable: staDrawByteTyre Low address bytes of the STA instructions in the DRAW_BYTE macros, for use when drawing track lines around the tyres
Screen buffer	Variable: dashData1 Contains code that gets moved into screen memory
Screen buffer	Variable: ldaDrawByte Low address bytes of the LDA #0 instructions in the DRAW_BYTE macros, for use when drawing track lines around the dashboard
Drawing the track	Variable: vergeEdgeInOut Table for mapping the verge tables to the outer and inner edges of the verge marks
Dashboard	Variable: handPixels The number of pixels in the longest axis for the rev counter hand at various points in a half-quadrant
Screen buffer	Variable: dashData2 Contains code that gets moved into screen memory
Screen buffer	Variable: staDrawByte Low address bytes of the STA instructions in the DRAW_BYTE macros, for use when drawing track lines around the dashboard
Screen buffer	Variable: dashData3 Contains code that gets moved into screen memory
Screen buffer	Subroutine: DrawFence (Part 2 of 2) Draw the fence that we crash into when running off the track
Text	Variable: token18 Text for recursive token 18
Screen buffer	Variable: dashData4 Contains code that gets moved into screen memory
Text	Subroutine: PrintDriverName Print a driver's name
Keyboard	Subroutine: CheckRestartKeys If the restart keys are being pressed, restart the game
Text	Variable: token19 Text for recursive token 19
Screen buffer	Variable: dashData5 Contains code that gets moved into screen memory
Text	Subroutine: GetNumberFromText Convert a two-digit string into a number
Drawing pixels	Variable: startDialLo The low byte of the screen address of the start of the dial hand on the rev counter
Text	Variable: token20 Text for recursive token 20
Screen buffer	Variable: dashData6 Contains code that gets moved into screen memory
Dashboard	Variable: leftDashPixels Pixels along the left edge of the dashboard
Drawing pixels	Variable: pixelsToLeft Pixel byte with all the pixels to the left of position X set
Screen buffer	Variable: dashData7 Contains code that gets moved into screen memory
Dashboard	Variable: rightDashPixels Pixels along the right edge of the dashboard
Drawing pixels	Variable: pixelsEdgeRight Pixel byte with all the pixels to the right of position X set, plus pixel X
Text	Variable: token11 Text for recursive token 11
Screen buffer	Variable: dashData8 Contains code that gets moved into screen memory
Maths (Arithmetic)	Subroutine: Absolute8Bit Calculate the absolute value (modulus) of an 8-bit number
Screen mode	Variable: paletteSection2 Colour palette for screen section 2 in the custom screen mode (part of the mode 5 portion)
Screen mode	Variable: paletteSection0 Colour palette for screen section 0 in the custom screen mode (the mode 4 portion)
Screen mode	Variable: paletteSection3 Colour palette for screen section 3 in the custom screen mode (part of the mode 5 portion)
Screen mode	Variable: paletteSection4 Colour palette for screen section 4 in the custom screen mode (part of the mode 5 portion)
Text	Variable: token25 Text for recursive token 25
Screen buffer	Variable: dashData9 Contains code that gets moved into screen memory
Keyboard	Subroutine: WaitForSpace Print a prompt, wait for the SPACE key to be released, and wait for SPACE to be pressed
Keyboard	Subroutine: WaitForSpaceReturn Print a prompt, wait for the SPACE key to be released, and wait for either SPACE or RETURN to be pressed
Drawing pixels	Variable: pixelByte A table of pixel bytes with individual pixels set
Text	Variable: token8 Text for recursive token 8
Text	Variable: token51 Text for recursive token 51
Screen buffer	Variable: dashData10 Contains code that gets moved into screen memory
3D objects	Variable: objectTop Scaffold measurements for the top of each object part
Dashboard	Variable: leftTyrePixels Pixels along the edge of the left tyre
Text	Variable: token31 Text for recursive token 31
Text	Variable: token3 Text for recursive token 3
Screen buffer	Variable: dashData11 Contains code that gets moved into screen memory
3D objects	Variable: objectBottom Scaffold measurements for the bottom of each object part
Dashboard	Variable: rightTyrePixels Pixels along the edge of the right tyre
Text	Variable: token0 Text for recursive token 0
Screen buffer	Variable: dashData12 Contains code that gets moved into screen memory
3D objects	Variable: objectLeft Scaffold measurements for the left of each object part
Dashboard	Variable: leftTyreMask Pixel mask for the edge of the left tyre
Text	Variable: token42 Text for recursive token 42
Text	Variable: token17 Text for recursive token 17
Screen buffer	Variable: dashData13 Contains code that gets moved into screen memory
3D objects	Variable: objectRight Scaffold measurements for the right of each object part
Dashboard	Variable: rightTyreMask Pixel mask for the edge of the right tyre
Text	Variable: token23 Text for recursive token 23
Text	Variable: token35 Text for recursive token 35
Screen buffer	Variable: dashData14 Contains code that gets moved into screen memory
3D objects	Variable: objectColour Data for the colour of each object part
Text	Variable: gearNumberText The character to print on the gear stick for each gear
Text	Variable: token43 Text for recursive token 43
Text	Variable: token44 Text for recursive token 44
Text	Variable: token45 Text for recursive token 45
Screen buffer	Variable: dashData15 Contains code that gets moved into screen memory
Text	Subroutine: Print2DigitBCD Print a binary coded decimal (BCD) number in the specified format
Text	Variable: token22 Text for recursive token 22
Text	Variable: token16 Text for recursive token 16
Screen buffer	Variable: dashData16 Contains code that gets moved into screen memory
Car geometry	Variable: carSpeedLo Low byte of each car's forward speed
Drivers	Variable: totalPointsLo Low byte of total accumulated points for each driver
Drivers	Variable: racePointsLo Used to store the low byte of the race points being awarded to the driver in race position X
Text	Variable: token39 Text for recursive token 39
Text	Variable: token48 Text for recursive token 48
Text	Variable: token49 Text for recursive token 49
Screen buffer	Variable: dashData17 Contains code that gets moved into screen memory
Dashboard	Variable: leftDashMask Pixel mask for the left edge of the dashboard
Drawing pixels	Variable: colourPalette The main colour palette that maps logical colours 0 to 3 to physical colours
Screen buffer	Variable: dashDataOffset Offset of the dash data within each dash data block
Screen buffer	Variable: dashData18 Contains code that gets moved into screen memory
Dashboard	Variable: rightDashMask Pixel mask for the right edge of the dashboard
Drawing pixels	Variable: startDialHi The high byte of the screen address of the start of the dial hand on the rev counter
Dashboard	Variable: wheelPixels The number of pixels in the longest axis for the steering wheel line at various points in a quadrant
Text	Variable: token32 Text for recursive token 32
Screen buffer	Variable: dashData19 Contains code that gets moved into screen memory
Drawing pixels	Variable: pixelsToRight Pixel byte with all the pixels to the right of position X set
Keyboard	Variable: configKeys Details of the configuration settings that are set by the shifted configuration keys
Keyboard	Variable: menuKeysSup Negative inkey values for the menu keys (SPACE, "1", "2" and "3") for the Superior Software release
Drivers	Variable: totalPointsHi High byte of total accumulated points for each driver
Drivers	Variable: racePointsHi High byte of race points calculated for each position
Text	Variable: token30 Text for recursive token 30
Text	Variable: token2 Text for recursive token 2
Screen buffer	Variable: dashData20 Contains code that gets moved into screen memory
Text	Subroutine: PrintHeaderChecks Print chequered lines above and below the header
Text	Variable: startChecks The screen address offset of the start of each chequered header line
Text	Variable: endChecks The screen address offset of the end of each chequered header line
Text	Variable: token53 Text for recursive token 53
Text	Variable: token41 Text for recursive token 41
Text	Variable: token38 Text for recursive token 38
Screen buffer	Variable: dashData21 Contains code that gets moved into screen memory
Text	Variable: tokenLo Low byte of the token address lookup table
Drawing pixels	Variable: yLookupHi Lookup table for converting pixel y-coordinate to high byte of screen address
Dashboard	Variable: mirrorAddressLo The low byte of the base screen address of each mirror segment
Screen buffer	Variable: dashData22 Contains code that gets moved into screen memory
Text	Variable: tokenHi high byte of the token address lookup table
Dashboard	Variable: shortAxis Code modifications for the DrawDashboardLine line-drawing routine
Dashboard	Variable: stepAxis Code modifications for the DrawDashboardLine line-drawing routine
Dashboard	Variable: mirrorAddressHi The high byte of the base screen address of each mirror segment
Dashboard	Variable: mirrorSegment Lookup table for working out which mirror segment a car should appear in
Screen buffer	Variable: dashData23 Contains code that gets moved into screen memory
Text	Variable: xHeader Column number for printing mode 7 headers
Text	Variable: yHeader Row number for printing mode 7 headers
Text	Variable: headerSpaces Number of spaces for printing mode 7 headers
Text	Variable: headerBackground Background colour for printing mode 7 headers
Text	Variable: headerForeground Foreground colour for printing mode 7 headers
Text	Variable: token46 Text for recursive token 46
Text	Variable: token24 Text for recursive token 24
Screen buffer	Variable: dashData24 Contains code that gets moved into screen memory

Revs F
------

Category	Details
Keyboard	Subroutine: GetWingSettings Get the front and rear wing settings from the player
Text	Subroutine: PrintRaceClass Print the race class
Text	Variable: token50 Text for recursive token 50
Text	Variable: token6 Text for recursive token 6
Text	Variable: token13 Text for recursive token 13
Text	Variable: token14 Text for recursive token 14
Text	Variable: token15 Text for recursive token 15
Screen buffer	Variable: dashData25 Contains code and part of the dashboard image that gets moved into screen memory
3D objects	Variable: objectIndex Index range of an object's data in the object data tables
3D objects	Variable: scaffoldIndex Index of an object's scaffold in the objectScaffold table
Text	Subroutine: GetDriverAddress Get the address of the specified driver's name
Text	Variable: token27 Text for recursive token 27
Text	Variable: token34 Text for recursive token 34
Screen buffer	Variable: dashData26 Contains part of the dashboard image that gets moved into screen memory
Text	Subroutine: PrintSpaces Print the specified number of spaces
Screen buffer	Subroutine: DrawFence (Part 1 of 2) Draw the fence that we crash into when running off the track
Screen buffer	Variable: fencePixelsGrass Pixel bytes for the fence with green grass behind it
Screen buffer	Variable: fencePixelsSky Pixel bytes for the fence with blue sky behind it
Text	Variable: token21 Text for recursive token 21
Screen buffer	Variable: dashData27 Contains part of the dashboard image that gets moved into screen memory
Track geometry	Variable: segmentStep The number of segments we step over when working backwards through the track segment buffer in GetSegmentAngles
Keyboard	Variable: shiftedKeys Negative inkey values for the configuration keys that are pressed in combination with SHIFT
Keyboard	Variable: menuKeys Negative inkey values for the menu keys (SPACE, "1", "2" and "3") for the Acornsoft release
Keyboard	Variable: timeFromOption Table to convert from the option numbers in the qualifying lap duration menu to the actual number of minutes
Keyboard	Variable: lapsFromOption Table to convert from the option numbers in the laps menu to the actual number of laps
Drivers	Variable: pointsForPlace The points awarded for the top six places, plus the fastest lap
Text	Variable: token29 Text for recursive token 29
Text	Variable: token9 Text for recursive token 9
Screen buffer	Variable: dashData28 Contains part of the dashboard image that gets moved into screen memory
Drawing the track	Variable: jumpShallowRight Branch labels for self-modifying code in the DrawShallowToRight routine
Text	Subroutine: SetRowColours Set the foreground and background colours for a table row
Text	Variable: rowColours Three different palettes for displaying even-odd rows in tables
Text	Variable: token10 Text for recursive token 10
Text	Variable: token12 Text for recursive token 12
Screen buffer	Variable: dashData29 Contains part of the dashboard image that gets moved into screen memory
Drawing the track	Variable: jumpSteepRight Branch labels for self-modifying code in the DrawSteepToRight routine
Drawing the track	Variable: jumpSteepLeft Branch labels for self-modifying code in the DrawSteepToLeft routine
Keyboard	Subroutine: GetNumberInput Fetch a number between 0 and 40 from the keyboard
Dashboard	Variable: startMirror The offset from mirrorAddress for the start of each mirror segment
Text	Variable: token37 Text for recursive token 37
Screen buffer	Variable: dashData30 Contains part of the dashboard image that gets moved into screen memory
Dashboard	Variable: fillDataOffset Dash data offsets, tweaked to give bottom line values that are compatible with the process of filling blocks to the left
Text	Variable: token7 Text for recursive token 7
Screen buffer	Variable: dashData31 Contains part of the dashboard image that gets moved into screen memory
Drawing pixels	Variable: yLookupLo Lookup table for converting pixel y-coordinate to low byte of screen address
Screen buffer	Variable: dashData32 Contains part of the dashboard image that gets moved into screen memory
Text	Variable: driverNames1 The first batch of driver names (1 of 5)
Screen buffer	Variable: dashData33 Contains part of the dashboard image that gets moved into screen memory
Drawing the track	Variable: jumpShallowLeft Branch labels for self-modifying code in the DrawShallowToLeft routine
Text	Variable: token33 Text for recursive token 33
Drivers	Subroutine: ResetBestLapTime Reset the best lap time to 10:00.0 for a specific driver
Dashboard	Variable: endMirror The offset from mirrorAddress for the end of each mirror segment
Screen buffer	Variable: dashData34 Contains part of the dashboard image that gets moved into screen memory
Text	Variable: driverNames2 The second batch of driver names (2 of 5)
Screen buffer	Variable: dashData35 Contains part of the dashboard image that gets moved into screen memory
Text	Subroutine: PrintHeader Configure and print a double-height header in screen mode 7
Text	Variable: token1 Text for recursive token 1
Screen buffer	Variable: dashData36 Contains part of the dashboard image that gets moved into screen memory
Text	Variable: driverNames3 The third batch of driver names (3 of 5)
Text	Variable: token40 Text for recursive token 40
Screen buffer	Variable: dashData37 Contains part of the dashboard image that gets moved into screen memory
Text	Subroutine: PrintGearNumber Print the number of the current gear in double-width characters on the gear stick
Drivers	Subroutine: ResetBestLapTimes Reset the best lap times to 10:00.0 for all drivers
Text	Variable: token52 Text for recursive token 52
Text	Variable: token28 Text for recursive token 28
Screen buffer	Variable: dashData38 Contains part of the dashboard image that gets moved into screen memory
Text	Variable: driverNames4 The fourth batch of driver names (4 of 5)
Text	Variable: token5 Text for recursive token 5
Text	Variable: token36 Text for recursive token 36
Screen buffer	Variable: dashData39 Contains part of the dashboard image that gets moved into screen memory
Text	Subroutine: Print234DigitBCD Print a specific driver's accumulated points as a padded two-, three- or four-digit number
Text	Subroutine: Print4DigitBCD Print a specific driver's accumulated points as a four-digit number
Sound	Subroutine: FlushSoundBuffers Flush all four specified sound buffers
Dashboard	Variable: dashRightEdge Storage for the first track pixel byte along the right edge of the dashboard
Screen buffer	Variable: dashData40 Contains part of the dashboard image that gets moved into screen memory
Text	Variable: driverNames5 The fifth batch of driver names (5 of 5)
3D objects	Variable: objectScaffold The scaffold used to construct each object, in a scalable format
Tactics	Subroutine: GetSectionSteering Calculate the optimum steering for each track section
Driving model	Subroutine: ApplyElevation (Part 1 of 5) Calculate changes in the car's elevation
Driving model	Subroutine: ApplyElevation (Part 2 of 5) Calculate the player's heading and sideways flag
Driving model	Subroutine: ApplyElevation (Part 3 of 5) Calculate player's elevation above the track
Driving model	Subroutine: ApplyElevation (Part 4 of 5) Calculate the height of the car above the track
Driving model	Subroutine: ApplyElevation (Part 5 of 5) Calculate the player's 3D y-coordinate and progress speed
Track geometry	Subroutine: MultiplyHeight Multiply the height above ground of a specified track segment by A
Car geometry	Subroutine: MovePlayerOnTrack Update the position of the player's car within the current track segment
Car geometry	Subroutine: GetCarInSegment Calculate the player car's position within the current segment
Car geometry	Subroutine: ScaleCarInSegment Work out how far a car is within a segment by scaling the angle in which the car is pointing
Driving model	Subroutine: ApplyDrivingModel Apply the driving model to the player's car
Driving model	Subroutine: ApplySpinYaw Calculate variables based on the spin yaw angle
Maths (Arithmetic)	Subroutine: Multiply8x16Signed Multiply an 8-bit and a 16-bit number and apply a sign to the result
Maths (Arithmetic)	Subroutine: MultiplyBy1Point5 Multiply a 16-bit signed number by 1.5
Driving model	Subroutine: ApplyTyresAndSkids Calculate the forces on the front or rear tyres and apply skid forces and sound effects where applicable
Driving model	Subroutine: ApplySteeringSpeed Apply steering to the car's speed in xVelocity and zVelocity
Driving model	Subroutine: ApplySteeringForce Apply steering to xTyreForceNose and zTyreForceNose
Driving model	Subroutine: AddSteeringForce Add the steering force to xVelocity or xTyreForceNose
Driving model	Subroutine: ScaleTyreForces Scale the tyre forces and calculate the combined tyre force on the player

Revs G
------

Category	Details
Maths (Arithmetic)	Subroutine: MultiplyCoords Multiply a 16-bit coordinate value and a 16-bit factor, optionally tallying or changing the sign of the result
Maths (Geometry)	Subroutine: SubtractCoords Subtract from a specified coordinate variable
Maths (Geometry)	Subroutine: AddCoords Add to a specified coordinate variable
Maths (Geometry)	Subroutine: RotateCoordToCar Rotate a vector from the 3D world coordinate system into the frame of reference of the player's car
Maths (Geometry)	Subroutine: RotateCarToCoord Rotate a vector from the frame of reference of the player's car into the 3D world coordinate system
Maths (Geometry)	Subroutine: RotateVector Rotate a vector by a rotation matrix
Driving model	Subroutine: ApplyDeltas Apply the deltas in the x-axis and z-axis to the player's coordinates
Driving model	Subroutine: UpdateVelocity Update the player's velocity and spin yaw angle
Driving model	Subroutine: ProcessEngineStart Process the key press for starting the engine
Driving model	Subroutine: CalcRevsNoTorque Calculate the value of the rev counter according to the throttle being applied and zero the engine torque
Driving model	Subroutine: ThrobRevsNoTorque Set the rev counter after adding a random throb and zero the engine torque
Driving model	Subroutine: SetRevsNoTorque Set the rev counter and zero the engine torque
Driving model	Subroutine: ZeroEngineTorque Zero engineTorque
Driving model	Subroutine: ApplyEngine Apply the effects of the engine
Driving model	Subroutine: SetEngineTorque Set engineTorque and soundRevTarget
Driving model	Subroutine: ApplyTyreForces Calculate the tyre forces on the car
Driving model	Subroutine: ApplySkidForces Calculate the tyre forces when the car is skidding
Driving model	Subroutine: ApplyLimitThrottle Apply a maximum limit to a 16-bit number, unless the throttle is being applied
Driving model	Subroutine: ApplyLimitAndSign Apply a maximum limit and a sign to a 16-bit number
Maths (Arithmetic)	Subroutine: Scale16Bit Scale up a 16-bit value by 2^5
Driving model	Subroutine: GetTyreForces Calculate the tyre forces due to the throttle or brakes
Driving model	Subroutine: ApplyGrassOrTrack Apply the effects of driving or braking on grass
Driving model	Variable: wingForceTrack The base downward force from the weight of the car when on the track, to which the downward force from the wings is added
Driving model	Variable: wingForceGrass The base downward force from the weight of the car when on grass, to which the downward force from the wings is added
Driving model	Subroutine: ApplyWingBalance Apply the effect of the wing settings
3D objects	Subroutine: BuildRoadSign Create an object for the road sign
Maths (Geometry)	Subroutine: AddScaledVector Add a scaled vector to another vector, one axis at a time
Drivers	Subroutine: InitialiseDrivers Initialise all 20 drivers on the starting grid
Text	Subroutine: PrintSecondLine Prints a text token on the second text line at the top of the driving screen
Text	Subroutine: PrintFirstLine Prints a text token on the first text line at the top of the driving screen
Text	Subroutine: PrintToken Print a recursive token
Driving model	Subroutine: ApplyVergeJump Apply a jump to the player's car when hitting the track verge
Driving model	Subroutine: ApplyBounce Apply a bounce to the player's car when it hits the ground
Screen mode	Subroutine: SetCustomScreen Switch to the custom screen mode
Screen mode	Subroutine: ScreenHandler The IRQ handler for the custom screen mode
Screen mode	Variable: screenRegisters The 6845 registers for the custom screen mode
Screen mode	Variable: irq1Address Stores the previous value of IRQ1V before we install our custom IRQ handler
Screen mode	Variable: screenTimer1 The screen timer offset between the start of section 2 and the start of section 3
Screen mode	Variable: screenTimer2 The screen timer offset between the start of section 3 and the start of section 4
Screen mode	Subroutine: KillCustomScreen Disable the custom screen mode and switch to mode 7
Screen mode	Subroutine: SetScreenMode7 Change to screen mode 7 and hide the cursor
Screen mode	Variable: screenSection The section of the screen that is currently being drawn by the custom screen interrupt handler (0 to 4)
Screen mode	Subroutine: MoveHorizon Move the position of the horizon palette switch up or down, depending on the current track pitch angle
Drivers	Subroutine: UpdateLaps Increment the lap number and lap times for a specific driver
Drivers	Subroutine: ZeroTimer Zero the specified timer
Text	Subroutine: PrintBestLapTime Print the best lap time and the current lap time at the top of the screen
Text	Subroutine: PrintLapTime Print the current lap time at the top of the screen
Keyboard	Subroutine: GetADCChannel Read the value of an ADC channel (used to read the joystick)
Main loop	Subroutine: ProcessTime Increment the timers and the main loop counter
Drivers	Subroutine: GetPositionAhead Decrement X to the previous position number (from 19 to 0 and round again), which gives the position ahead of X
Drivers	Subroutine: GetPositionBehind Increment X to the next position number (from 0 to 19 and round again), which gives the position behind X
Text	Subroutine: PrintCharacter Print a character on-screen
Drawing pixels	Subroutine: GetScreenAddress Return the screen address for a specified screen coordinate
Dashboard	Subroutine: EraseRevCounter Erase a line by replacing each pixel in the line with its original contents
Dashboard	Subroutine: UpdateDashboard Update the rev counter and steering wheel lines on the dashboard
Dashboard	Subroutine: DrawRevCounter Draw the hand on the rev counter
Dashboard	Subroutine: DrawDashboardLine Draw a hand on the rev counter or a line on the steering wheel
Dashboard	Subroutine: AnimateTyres Update screen memory to animate the tyres
Dashboard	Variable: tyreTreadLeft Tyre tread pattern for the left tyre
Dashboard	Variable: tyreTreadRight Tyre tread pattern for the right tyre
Track data	Workspace: trackData This is where the track data gets loaded
Screen buffer	Variable: dashData41 Contains part of the dashboard image that gets moved into screen memory
Setup	Subroutine: CallTrackHook The track file's hook code
Drivers	Subroutine: AwardRacePoints Award points following a race

Revs H
------

Category	Details
Track geometry	Variable: xVergeRightLo Low byte of segment yaw angles along the right track verge in front of the player (i.e. along the x-axis)
Track geometry	Variable: xVergeLeftLo Low byte of segment yaw angles along the left track verge in front of the player (i.e. along the x-axis)
Track geometry	Variable: xVergeRightHi High byte of segment yaw angles along the right track verge in front of the player (i.e. along the x-axis)
Track geometry	Variable: xVergeLeftHi High byte of segment yaw angles along the left track verge in front of the player (i.e. along the x-axis)
Track geometry	Variable: vergeDataRight Data (such as colour) for the verge marks on the right side of the track
3D objects	Variable: scaledScaffold Storage for an object's scaled scaffold
Track geometry	Variable: vergeDataLeft Data (such as colour) for the verge marks on the left side of the track
Track geometry	Variable: yVergeRight Segment pitch angles along the right track verge in front of the player (i.e. along the up-down y-axis)
Drivers	Variable: numberOfPlayers The number of players
Drivers	Variable: lowestPlayerNumber The number of the player with the lowest player number
Drivers	Variable: raceClass The class of the current race
Drivers	Variable: qualifyingTime The number of minutes of qualifying lap time
Drivers	Variable: competitionStarted A flag to indicate whether or not the competition has started
Driving model	Variable: frontWingSetting The front wing setting, as entered by the player
Driving model	Variable: rearWingSetting The rear wing setting, as entered by the player
Drivers	Variable: lapsMenuOption The menu option chosen from the laps menu (0 to 2)
Drivers	Variable: baseSpeed The base speed for each car, copied from the track data
Track geometry	Variable: yVergeLeft Segment pitch angles along the left track verge in front of the player (i.e. along the up-down y-axis)
Screen buffer	Variable: backgroundColour The background colour for each track line
Tactics	Variable: sectionSteering The optimum steering for each section
Drawing the track	Variable: vergePixelMask Pixel bytes for drawing track verge edges
3D objects	Variable: scaleRange Storage for scale factors when scaling objects
Screen buffer	Variable: zeroIfYIs55 A lookup table for zeroing Y if and only if it is &55
Maths (Geometry)	Variable: arctanY Table for arctan values when calculating yaw angles
Maths (Arithmetic)	Variable: divideX Division table for calculating scale factors using 1 / \|x-delta\|
Car geometry	Variable: xPlayerCoordHi The high byte of the x-coordinate of the player's 3D coordinates
Car geometry	Variable: yPlayerCoordHi The high byte of the y-coordinate of the player's 3D coordinates
Car geometry	Variable: zPlayerCoordHi The high byte of the z-coordinate of the player's 3D coordinates
Car geometry	Variable: xPlayerCoordTop The top byte of the x-coordinate of the player's 3D coordinates
Car geometry	Variable: yPlayerCoordTop The top byte of the y-coordinate of the player's 3D coordinates
Car geometry	Variable: zPlayerCoordTop The top byte of the z-coordinate of the player's 3D coordinates
3D objects	Variable: xRoadSignCoordLo The low byte of the x-coordinate of the road sign's 3D coordinates
3D objects	Variable: yRoadSignCoordLo The low byte of the y-coordinate of the road sign's 3D coordinates
3D objects	Variable: zRoadSignCoordLo The low byte of the z-coordinate of the road sign's 3D coordinates
3D objects	Variable: xRoadSignCoordHi The high byte of the x-coordinate of the road sign's 3D coordinates
3D objects	Variable: yRoadSignCoordHi The high byte of the y-coordinate of the road sign's 3D coordinates
3D objects	Variable: zRoadSignCoordHi The high byte of the z-coordinate of the road sign's 3D coordinates
3D objects	Variable: objectPalette The object colour palette that maps logical colours 0 to 3 to physical colours
Dashboard	Variable: mirrorContents Contains the size of the car in each mirror segment
Track geometry	Variable: markerData The segment flags for each of the three corner markers
Drawing the track	Variable: vergeEdgeRight Contain the four pixel bytes for the verge edge we are drawing, masked to only include the rightmost 4, 3, 2 and 1 pixels
Driving model	Variable: sinYawAngleLo Low byte of the sine of the player's yaw angle
Driving model	Variable: cosYawAngleLo Low byte of the cosine of the player's yaw angle
Dashboard	Variable: steeringLo The low byte of the steering wheel position
Driving model	Variable: sinYawAngleHi High byte of the sine of the player's yaw angle
Driving model	Variable: cosYawAngleHi High byte of the cosine of the player's yaw angle
Dashboard	Variable: steeringHi The high byte of the steering wheel position
Driving model	Variable: tyreSqueal A flag to determine whether the front or rear tyres are squealing
Driving model	Variable: wingSetting Contains the scaled wing settings
Driving model	Variable: wingForce The downward force from the front and rear wings
Driving model	Variable: wingForce95 95% of the downward force from the front and rear wings
Driving model	Variable: xPlayerSpeedLo Low byte of the x-coordinate of the velocity vector (i.e. x-axis speed) for the player's car during this main loop iteration
Driving model	Variable: zPlayerSpeedLo Low byte of the z-coordinate of the velocity vector (i.e. z-axis speed) for the player's car during this main loop iteration
Car geometry	Variable: spinYawAngleLo Low byte of the amount of yaw angle spin that is being applied to the player's car
Car geometry	Variable: xPlayerCoordLo The low byte of the x-coordinate of the player's 3D coordinates
Car geometry	Variable: yPlayerCoordLo The low byte of the y-coordinate of the player's 3D coordinates
Car geometry	Variable: zPlayerCoordLo The low byte of the z-coordinate of the player's 3D coordinates
Track geometry	Variable: markerListIndex The index of the corresponding entry in the track segment list for each of the three corner markers
Track geometry	Variable: xMarkerLo Low byte of the x-axis distance between the track edge and the three corner markers
Track geometry	Variable: xMarkerHi High byte of the x-axis distance between the track edge and the three corner markers
Sound	Variable: soundBuffer Details of each sound channel's buffer status
Text	Variable: characterDef Storage for a character definition when printing characters
Text	Variable: xCursor The cursor's x-coordinate, which can either be a pixel coordinate or a character row
Text	Variable: yCursor The cursor's pixel y-coordinate
Driving model	Variable: xPlayerSpeedHi High byte of the x-coordinate of the velocity vector (i.e. x-axis speed) for the player's car during this main loop iteration
Driving model	Variable: zPlayerSpeedHi High byte of the z-coordinate of the velocity vector (i.e. z-axis speed) for the player's car during this main loop iteration
Car geometry	Variable: spinYawAngleHi High byte of the amount of yaw angle spin that is being applied to the player's car
Driving model	Variable: xAccelerationLo Low byte of the x-coordinate of the change in velocity of the player's car in terms of 3D world coordinates
Driving model	Variable: zAccelerationLo Low byte of the z-coordinate of the change in velocity of the player's car in terms of 3D world coordinates
Driving model	Variable: spinYawDeltaLo Low byte of the change in the spin yaw angle for the player's car
Driving model	Variable: xPlayerAccelLo Low byte of the x-coordinate of the change in velocity of the player's car in the player's frame of reference
Driving model	Variable: zPlayerAccelLo Low byte of the z-coordinate of the change in velocity of the player's car in the player's frame of reference
Driving model	Variable: xVelocityLo Low byte of the x-coordinate of the player's velocity vector, from the player's frame of reference
Driving model	Variable: zVelocityLo Low byte of the z-coordinate of the player's velocity vector, from the player's frame of reference
Driving model	Variable: xTyreForceNoseLo Low byte of the x-coordinate of the force vector produced by the front tyres in the nose of the car
Driving model	Variable: xTyreForceRearLo Low byte of the x-coordinate of the force vector produced by the rear tyres of the car
Driving model	Variable: zTyreForceNoseLo Low byte of the z-coordinate of the force vector produced by the front tyres in the nose of the car
Driving model	Variable: zTyreForceRearLo Low byte of the z-coordinate of the force vector produced by the rear tyres
Driving model	Variable: xSteeringForceLo Low byte of the sideways force applied by steering
Main loop	Variable: mainLoopCounterHi High byte of the main loop counter, which increments on each iteration of the main driving loop
Driving model	Variable: xPlayerSpeedTop Top byte of the x-coordinate of the velocity vector (i.e. x-axis speed) for the player's car during this main loop iteration
Driving model	Variable: zPlayerSpeedTop Top byte of the z-coordinate of the velocity vector (i.e. z-axis speed) for the player's car during this main loop iteration
Car geometry	Variable: spinYawAngleTop Top byte of the amount of yaw angle spin that is being applied to the player's car
Driving model	Variable: xAccelerationHi High byte of the x-coordinate of the change in velocity of the player's car in terms of 3D world coordinates
Driving model	Variable: zAccelerationHi High byte of the z-coordinate of the change in velocity of the player's car in terms of 3D world coordinates
Driving model	Variable: spinYawDeltaHi High byte of the change in the spin yaw angle for the player's car
Driving model	Variable: xPlayerAccelHi High byte of the x-coordinate of the change in velocity of the player's car in the player's frame of reference
Driving model	Variable: zPlayerAccelHi High byte of the z-coordinate of the change in velocity of the player's car in the player's frame of reference
Driving model	Variable: xVelocityHi High byte of the x-coordinate of the player's velocity vector, from the player's frame of reference
Driving model	Variable: zVelocityHi High byte of the z-coordinate of the player's velocity vector, from the player's frame of reference
Driving model	Variable: xTyreForceNoseHi High byte of the x-coordinate of the force vector produced by the front tyres in the nose of the car
Driving model	Variable: xTyreForceRearHi High byte of the x-coordinate of the force vector produced by the rear tyres of the car
Driving model	Variable: zTyreForceNoseHi High byte of the z-coordinate of the force vector produced by the front tyres in the nose of the car
Driving model	Variable: zTyreForceRearHi High byte of the z-coordinate of the force vector produced by the rear tyres
Driving model	Variable: xSteeringForceHi High byte of the sideways force applied by steering
Drivers	Variable: firstLapStarted Flag to keep track of whether we have started the first lap of practice or qualifying
Driving model	Variable: liftFromTorque The lift of the front of the car caused by acceleration or braking
Driving model	Variable: wingBalance Value used in the driving model when calculating the effect of the two wing settings
Car geometry	Variable: playerSideways Contains the player's heading, for testing whether the car is pointing sideways
3D objects	Variable: thisObjectType The type of object we are currently drawing
Drawing objects	Variable: thisDriverNumber The number of the current driver when drawing cars
Track geometry	Variable: newSectionFetched Flag that determines whether a new track section has been fetched
Car geometry	Variable: crashedIntoFence Flag that records whether we have crashed into the fence
Screen mode	Variable: irqCounter Counter that gets incremented every time the IRQ routine reaches section 4 of the custom screen
Drivers	Variable: updateLapTimes Controls whether moving the car forward updates the lap number and lap times
Track geometry	Variable: previousSignNumber Stores the number of the sign from the previous call to the BuildRoadSign routine
Dashboard	Variable: tyreTravel Keeps track of how far we have travelled so we know when to animate the tyres
Driving model	Variable: playerDrift Records whether the player's car is moving sideways by a significant amount
Track geometry	Variable: horizonTrackWidth The arc of the track at the horizon (i.e. the track width at the horizon), halved
Screen buffer	Variable: lowestTrackLine Used to prevent objects from being drawn below the horizon line
Text	Variable: updateDriverInfo Flag that controls whether the driver names are updated in the information block at the top of the screen
Driving model	Variable: zTyreForceBoth High byte of the z-coordinate of the force vector produced by the front and tyres combined

Revs I
------

Category	Details
Keyboard	Subroutine: GetTextInput Fetch a string from the keyboard, padded with spaces if required
Drivers	Subroutine: SetDriverSpeed Set the speed for a specific driver
Drivers	Subroutine: SetPlayerPositions Set the current player's position, plus the positions behind and in front
Setup	Subroutine: Protect Decrypt or unprotect the game code (disabled)
Tactics	Subroutine: GetSteeringAssist Fetch the current computer assisted steering (CAS) status and show or hide the CAS indicator
Setup	Subroutine: SetupGame Decrypt or unprotect the game code (disabled)
Main loop	Subroutine: MainLoop (Part 1 of 6) The main game loop: practice laps
Main loop	Subroutine: MainLoop (Part 2 of 6) The main game loop: competition setup
Main loop	Subroutine: MainLoop (Part 3 of 6) The main game loop: qualifying laps
Main loop	Subroutine: MainLoop (Part 4 of 6) The main game loop: the competition race
Main loop	Subroutine: MainLoop (Part 5 of 6) The main game loop: the competition race
Main loop	Subroutine: MainLoop (Part 6 of 6) The main game loop: race points and competition results
Main Loop	Subroutine: HeadToTrack Get the wing settings and start a race, practice or qualifying lap
Keyboard	Subroutine: GetMenuOption Scan the keyboard for a menu entry number, highlight the choice, show the SPACE bar message and return the choice number
Maths (Arithmetic)	Subroutine: ConvertNumberToBCD Convert a number into binary coded decimal (BCD), for printing
Text	Subroutine: PrintDriverTable Print the table of drivers
Text	Subroutine: PrintNearestDriver Print a driver's name in the "In front" or "Behind" slot in the header
Text	Subroutine: PrintPositionName Print the name of the driver in a specific position in the driver position list
Text	Subroutine: PrintDriverPrompt Print the "DRIVER ->" prompt and a driver's name, to show whose turn it is next when playing a multi-player game
Drivers	Subroutine: AddRacePoints Add the race points to the driver's total points
Screen buffer	Subroutine: ResetTrackLines Reset the track lines below the horizon in the track view
Keyboard	Subroutine: GetDriverName Fetch a player's name from the keyboard
Drawing objects	Subroutine: DrawCars Draw all the car objects, with four objects for the closest car in front of us
Screen buffer	Variable: dashData42 Contains part of the dashboard image that gets moved into screen memory
Dashboard	Subroutine: UpdateMirrors Update the wing mirrors to show any cars behind us
Dashboard	Subroutine: ShowStartingLights Show the lights at the start of the race
Text	Subroutine: PrintTimer Print the specified timer
Screen buffer	Subroutine: DrawTrackView (Part 4 of 4) Revert all the code modifications made by the DrawTrackView routine
Screen buffer	Subroutine: DrawTrackView (Part 1 of 4) Draw the top part of the track view using the data in the dash data blocks
Screen buffer	Subroutine: DrawTrackLine (Part 2 of 2) Draw a pixel line across the screen in the track view
Screen buffer	Macro: DRAW_BYTE Draw a pixel byte as part of a horizontal line when drawing the track view
Screen buffer	Subroutine: DrawTrackBytes (Part 1 of 3) Draw the pixel bytes that make up the track view (0 to 15)
Screen buffer	Subroutine: DrawTrackView (Part 2 of 4) Draw the part of the track view that fits around the dashboard
Screen buffer	Subroutine: DrawTrackBytes (Part 2 of 3) Draw the pixel bytes that make up the track view (16 to 39)
Screen buffer	Subroutine: DrawTrackLine (Part 1 of 2) Draw a pixel line across the screen in the track view, broken up into bytes
Screen buffer	Subroutine: DrawTrackBytes (Part 3 of 3) Return from the subroutine
Screen buffer	Subroutine: DrawTrackView (Part 3 of 4) Draw the part of the track view that fits around the dashboard and tyres
Dashboard	Subroutine: DrawCarInMirror Draw a car in a specified segment of one of the wing mirrors, or clear a specified segment

Silverstone track data file
---------------------------

Category	Details
Track data	Variable: Track section data (Part 1 of 2) (Silverstone) Data for the track sections
Track data	Variable: xTrackSignVector (Silverstone) The x-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Track data	Variable: zTrackSignVector (Silverstone) The z-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Track data	Variable: yTrackSignVector (Silverstone) The y-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Track data	Variable: xTrackSegmentI (Silverstone) Vector x-coordinates between two consecutive segments on the inside of the track
Track data	Variable: yTrackSegmentI (Silverstone) Vector y-coordinates between two consecutive segments on the inside of the track
Track data	Variable: zTrackSegmentI (Silverstone) Vector z-coordinates between two consecutive segments on the inside of the track
Track data	Variable: xTrackSegmentO (Silverstone) Vector x-coordinates from the inside to the outside of the track for each segment
Track data	Variable: zTrackSegmentO (Silverstone) Vector z-coordinates from the inside to the outside of the track for each segment
Track data	Variable: Track section data (Part 2 of 2) (Silverstone) Data for the track sections
Track data	Variable: trackSteering (Silverstone) The optimum steering for non-player drivers on each track section
Track data	Variable: trackSignData (Silverstone) Base coordinates and object types for 16 road signs
Track data	Variable: trackSectionCount (Silverstone) The total number of track sections * 8
Track data	Variable: trackVectorCount (Silverstone) The total number of segment vectors in the segment vector tables
Track data	Variable: trackLength (Silverstone) The length of the full track in terms of segments
Track data	Variable: trackStartLine (Silverstone) The segment number of the starting line
Track data	Variable: trackLapTimeSec (Silverstone) Lap times for adjusting the race class (seconds)
Track data	Variable: trackLapTimeMin (Silverstone) Lap times for adjusting the race class (minutes)
Track data	Variable: trackGearRatio (Silverstone) The gear ratio for each gear
Track data	Variable: trackGearPower (Silverstone) The power for each gear
Track data	Variable: trackBaseSpeed (Silverstone) The base speed for each race class, used when generating the best racing lines and non-player driver speeds
Track data	Variable: trackStartPosition (Silverstone) The starting race position of the player during a practice or qualifying lap
Track data	Variable: trackCarSpacing (Silverstone) The spacing between the cars at the start of a qualifying lap, in segments
Track data	Variable: trackTimerAdjust (Silverstone) Adjustment factor for the speed of the timers to allow for fine-tuning of time on a per-track basis
Track data	Variable: trackRaceSlowdown (Silverstone) Slowdown factor for non-player drivers in the race
Track data	Subroutine: CallTrackHook (Silverstone) The track file's hook code
Track data	Variable: trackChecksum (Silverstone) The track file's checksum
Track data	Variable: trackGameName (Silverstone) The game name
Track data	Variable: trackName (Silverstone) The track name

Brands Hatch track data file
----------------------------

Category	Details
Extra tracks	Variable: Track section data (Part 1 of 2) (Brands Hatch) Data for the track sections
Extra tracks	Subroutine: Hook80Percent (Brands Hatch) Set the horizonTrackWidth to 80% of the width of the track on the horizon
Extra tracks	Variable: subSection (Brands Hatch) The number of the current sub-section
Extra tracks	Variable: trackSubCount (Brands Hatch) The total number of sub-sections in the track
Extra tracks	Variable: yawAngleLo (Brands Hatch) Low byte of the current yaw angle of the track, i.e. the angle at which the track is pointing along the ground
Extra tracks	Variable: yawAngleHi (Brands Hatch) High byte of the current yaw angle of the track, i.e. the angle at which the track is pointing along the ground
Extra tracks	Variable: segmentSlope (Brands Hatch) The height above ground of the current track sub-section
Extra tracks	Variable: subSectionSegment (Brands Hatch) The number of the segment within the current sub-section, counting from the start of the sub-section
Extra tracks	Variable: modifyAddressLo (Brands Hatch) Low byte of the location in the main game code where we modify a two-byte address
Extra tracks	Variable: modifyAddressHi (Brands Hatch) High byte of the location in the main game code where we modify a two-byte address
Extra tracks	Variable: trackYawDeltaHi (Brands Hatch) High byte of the change in yaw angle that we apply to each segment in the specified sub-section when building the track
Track data	Variable: trackSignData (Brands Hatch) Base coordinates and object types for 16 road signs
Extra tracks	Subroutine: CalcSegmentVector (Brands Hatch) Calculate the segment vector for the current segment
Extra tracks	Subroutine: HookFlipAbsolute (Brands Hatch) Set the sign of A according to the direction we are facing along the track
Extra tracks	Subroutine: HookDataPointers (Brands Hatch) If the current section is dynamically generated, update the data pointers
Extra tracks	Variable: newContentLo (Brands Hatch) Low byte of the two-byte address that we want to poke into the main game code at the modify location
Extra tracks	Variable: newContentHi (Brands Hatch) High byte of the two-byte address that we want to poke into the main game code at the modify location
Extra tracks	Variable: trackYawDeltaLo (Brands Hatch) Low byte of the change in yaw angle that we apply to each segment in the specified sub-section when building the track
Extra tracks	Variable: xTrackSignVector (Brands Hatch) The x-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookSegmentVector (Brands Hatch) If the current section is dynamically generated, move to the next segment vector, calculate it and store it
Extra tracks	Subroutine: MoveToNextVector (Brands Hatch) Move to the next to the next segment vector along the track and update the pointers
Extra tracks	Subroutine: UpdateDataPointers (Brands Hatch) Update the sub-section and segment numbers to point to the next segment along the track in the correct direction
Extra tracks	Subroutine: HookMoveBack (Brands Hatch) Only move the player backwards if the player has not yet driven past the segment
Extra tracks	Subroutine: SetSegmentVector (Brands Hatch) Add the yaw angle and height deltas to the yaw angle and height (for curved sections) and calculate the segment vector
Extra tracks	Subroutine: ModifyGameCode (Part 3 of 3) (Brands Hatch) Modify the game code to support the extra track data
Extra tracks	Variable: trackSlopeDelta (Brands Hatch) The change in the slope (i.e. the change in the gradient) over the course of each segment for each sub-section of the track
Extra tracks	Variable: yTrackSignVector (Brands Hatch) The y-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookSectionFrom (Brands Hatch) Initialise and calculate the current segment vector
Extra tracks	Subroutine: HookUpdateHorizon (Brands Hatch) Only update the horizon if we have found fewer than 12 visible segments
Extra tracks	Subroutine: HookFieldOfView (Brands Hatch) When populating the verge buffer in GetSegmentAngles, don't give up so easily when we get segments outside the field of view
Extra tracks	Subroutine: HookFlattenHills (Brands Hatch) Flatten any hills in the verge buffer, calculate the hill height and track width, cut objects off at the hill height
Extra tracks	Subroutine: ModifyGameCode (Part 1 of 3) (Brands Hatch) Modify the game code to support the extra track data
Extra tracks	Variable: trackSubSize (Brands Hatch) The size of each sub-section, i.e. the number of segments in each sub-section
Extra tracks	Variable: zTrackSignVector (Brands Hatch) The z-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookFixHorizon (Brands Hatch) Apply the horizon line in A instead of horizonLine
Extra tracks	Subroutine: HookJoystick (Brands Hatch) Apply enhanced joystick steering to specific track sections
Extra tracks	Subroutine: Multiply8x8Signed (Brands Hatch) Multiply two 8-bit numbers, one of which is signed
Extra tracks	Variable: xTrackCurve (Brands Hatch) The x-coordinate of the tangent vector (i.e. the curve direction) at 64 points on a one-eighth circle covering 0 to 45 degrees
Extra tracks	Subroutine: ModifyGameCode (Part 2 of 3) (Brands Hatch) Modify the game code to support the extra track data
Extra tracks	Variable: trackSlope (Brands Hatch) The slope at the start of each track section
Extra tracks	Variable: trackYawAngleLo (Brands Hatch) The low byte of the yaw angle of the start of each track section (i.e. the direction of the track at that point)
Extra tracks	Variable: trackYawAngleHi (Brands Hatch) The high byte of the yaw angle of the start of each track section (i.e. the direction of the track at that point)
Extra tracks	Variable: trackSubConfig (Brands Hatch) Configuration data for each section that defines the sub-section numbers, and horizon calculations
Extra tracks	Variable: trackSteering (Brands Hatch) The optimum steering for non-player drivers on each track section
Extra tracks	Variable: zTrackCurve (Brands Hatch) The z-coordinate of the tangent vector (i.e. the curve direction) at 64 points on a one-eighth circle covering 0 to 45 degrees
Extra tracks	Variable: Track section data (Part 2 of 2) (Brands Hatch) Data for the track sections
Extra tracks	Subroutine: HookSlopeJump (Brands Hatch) Jump the car when driving fast over sloping segments
Extra tracks	Variable: trackSectionCount (Brands Hatch) The total number of track sections * 8
Track data	Variable: trackVectorCount (Brands Hatch) The total number of segment vectors in the segment vector tables
Track data	Variable: trackLength (Brands Hatch) The length of the full track in terms of segments
Track data	Variable: trackStartLine (Brands Hatch) The segment number of the starting line
Extra tracks	Variable: trackLapTimeSec (Brands Hatch) Lap times for adjusting the race class (seconds)
Extra tracks	Variable: trackLapTimeMin (Brands Hatch) Lap times for adjusting the race class (minutes)
Extra tracks	Variable: trackGearRatio (Brands Hatch) The gear ratio for each gear
Extra tracks	Variable: trackGearPower (Brands Hatch) The power for each gear
Extra tracks	Variable: trackBaseSpeed (Brands Hatch) The base speed for each race class, used when generating the best racing lines and non-player driver speeds
Extra tracks	Variable: trackStartPosition (Brands Hatch) The starting race position of the player during a practice or qualifying lap
Extra tracks	Variable: trackCarSpacing (Brands Hatch) The spacing between the cars at the start of a qualifying lap, in segments
Extra tracks	Variable: trackTimerAdjust (Brands Hatch) Adjustment factor for the speed of the timers to allow for fine-tuning of time on a per-track basis
Extra tracks	Variable: trackRaceSlowdown (Brands Hatch) Slowdown factor for non-player drivers in the race
Extra tracks	Subroutine: HookFirstSegment (Brands Hatch) Move to the next to the next segment vector along the track and calculate the segment vector
Extra tracks	Subroutine: CallTrackHook (Brands Hatch) The track file's hook code
Extra tracks	Variable: trackChecksum (Brands Hatch) The track file's checksum
Extra tracks	Variable: trackGameName (Brands Hatch) The game name
Extra tracks	Variable: trackName (Brands Hatch) The track name

Donington Park track data file
------------------------------

Category	Details
Extra tracks	Variable: Track section data (Part 1 of 2) (Donington Park) Data for the track sections
Extra tracks	Subroutine: Multiply80Percent (Donington Park) Calculate (A T) = 0.80 * A
Extra tracks	Subroutine: HookFlipAbsolute (Donington Park) Set the sign of A according to the direction we are facing along the track
Extra tracks	Subroutine: HookJoystick (Part 3 of 3) (Donington Park) Apply enhanced joystick steering to specific track sections
Extra tracks	Subroutine: HookForward (Donington Park) Move the player forward by an extra segment when edgeSegmentNumber is 10
Extra tracks	Subroutine: ModifyGameCode (Part 4 of 4) (Donington Park) Modify the game code to support the extra track data
Extra tracks	Variable: subSection (Donington Park) The number of the current sub-section
Extra tracks	Variable: trackSubCount (Donington Park) The total number of sub-sections in the track
Extra tracks	Variable: yawAngleLo (Donington Park) Low byte of the current yaw angle of the track, i.e. the angle at which the track is pointing along the ground
Extra tracks	Variable: yawAngleHi (Donington Park) High byte of the current yaw angle of the track, i.e. the angle at which the track is pointing along the ground
Extra tracks	Variable: segmentSlope (Donington Park) The height above ground of the current track sub-section
Extra tracks	Variable: subSectionSegment (Donington Park) The number of the segment within the current sub-section, counting from the start of the sub-section
Extra tracks	Variable: modifyAddressLo (Donington Park) Low byte of the location in the main game code where we modify a two-byte address
Extra tracks	Variable: modifyAddressHi (Donington Park) High byte of the location in the main game code where we modify a two-byte address
Extra tracks	Variable: trackYawDeltaHi (Donington Park) High byte of the change in yaw angle that we apply to each segment in the specified sub-section when building the track
Track data	Variable: trackSignData (Donington Park) Base coordinates and object types for 16 road signs
Extra tracks	Subroutine: CalcSegmentVector (Donington Park) Calculate the segment vector for the current segment
Extra tracks	Subroutine: Multiply8x8Signed (Donington Park) Multiply two 8-bit numbers, one of which is signed
Extra tracks	Subroutine: HookDataPointers (Donington Park) If the current section is dynamically generated, update the data pointers
Extra tracks	Variable: newContentLo (Donington Park) Low byte of the two-byte address that we want to poke into the main game code at the modify location
Extra tracks	Variable: newContentHi (Donington Park) High byte of the two-byte address that we want to poke into the main game code at the modify location
Extra tracks	Variable: trackYawDeltaLo (Donington Park) Low byte of the change in yaw angle that we apply to each segment in the specified sub-section when building the track
Extra tracks	Variable: xTrackSignVector (Donington Park) The x-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookSegmentVector (Donington Park) If the current section is dynamically generated, move to the next segment vector, calculate it and store it
Extra tracks	Subroutine: MoveToNextVector (Donington Park) Move to the next to the next segment vector along the track and update the pointers
Extra tracks	Subroutine: UpdateDataPointers (Donington Park) Update the sub-section and segment numbers to point to the next segment along the track in the correct direction
Extra tracks	Subroutine: HookMoveBack (Donington Park) Only move the player backwards if the player has not yet driven past the segment
Extra tracks	Subroutine: SetSegmentVector (Donington Park) Add the yaw angle and height deltas to the yaw angle and height (for curved sections) and calculate the segment vector
Extra tracks	Subroutine: ModifyGameCode (Part 3 of 4) (Donington Park) Modify the game code to support the extra track data
Extra tracks	Variable: trackSlopeDelta (Donington Park) The change in the slope (i.e. the change in the gradient) over the course of each segment for each sub-section of the track
Extra tracks	Variable: yTrackSignVector (Donington Park) The y-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookSectionFrom (Donington Park) Initialise and calculate the current segment vector
Extra tracks	Subroutine: HookUpdateHorizon (Donington Park) Only update the horizon if we have found fewer than 12 visible segments
Extra tracks	Subroutine: HookFieldOfView (Donington Park) When populating the verge buffer in GetSegmentAngles, don't give up so easily when we get segments outside the field of view
Extra tracks	Subroutine: HookFlattenHills (Donington Park) Flatten any hills in the verge buffer, calculate the hill height and track width, cut objects off at the hill height
Extra tracks	Subroutine: ModifyGameCode (Part 1 of 4) (Donington Park) Modify the game code to support the extra track data
Extra tracks	Variable: trackSubSize (Donington Park) The size of each sub-section, i.e. the number of segments in each sub-section
Extra tracks	Variable: zTrackSignVector (Donington Park) The z-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookFixHorizon (Donington Park) Apply the horizon line in A instead of horizonLine
Extra tracks	Subroutine: HookJoystick (Part 1 of 3) (Donington Park) Apply enhanced joystick steering to specific track sections
Extra tracks	Subroutine: Hook80Percent (Donington Park) Set the horizonTrackWidth to 80% of the width of the track on the horizon
Extra tracks	Variable: xTrackCurve (Donington Park) The x-coordinate of the tangent vector (i.e. the curve direction) at 64 points on a one-eighth circle covering 0 to 45 degrees
Extra tracks	Subroutine: ModifyGameCode (Part 2 of 4) (Donington Park) Modify the game code to support the extra track data
Extra tracks	Variable: trackSlope (Donington Park) The slope at the start of each track section
Extra tracks	Variable: trackYawAngleLo (Donington Park) The low byte of the yaw angle of the start of each track section (i.e. the direction of the track at that point)
Extra tracks	Variable: trackYawAngleHi (Donington Park) The high byte of the yaw angle of the start of each track section (i.e. the direction of the track at that point)
Extra tracks	Variable: trackSubConfig (Donington Park) Configuration data for each section that defines the sub-section numbers, and horizon calculations
Extra tracks	Variable: trackSteering (Donington Park) The optimum steering for non-player drivers on each track section
Extra tracks	Variable: zTrackCurve (Donington Park) The z-coordinate of the tangent vector (i.e. the curve direction) at 64 points on a one-eighth circle covering 0 to 45 degrees
Extra tracks	Variable: Track section data (Part 2 of 2) (Donington Park) Data for the track sections
Extra tracks	Subroutine: HookSlopeJump (Donington Park) Jump the car when driving fast over sloping segments
Extra tracks	Subroutine: HookJoystick (Part 2 of 3) (Donington Park) Apply enhanced joystick steering to specific track sections
Extra tracks	Subroutine: HookBackground (Donington Park) Do not update the background colour when the track line above is showing green for the leftTrackStart verge
Extra tracks	Variable: trackSectionCount (Donington Park) The total number of track sections * 8
Track data	Variable: trackVectorCount (Donington Park) The total number of segment vectors in the segment vector tables
Track data	Variable: trackLength (Donington Park) The length of the full track in terms of segments
Track data	Variable: trackStartLine (Donington Park) The segment number of the starting line
Extra tracks	Variable: trackLapTimeSec (Donington Park) Lap times for adjusting the race class (seconds)
Extra tracks	Variable: trackLapTimeMin (Donington Park) Lap times for adjusting the race class (minutes)
Extra tracks	Variable: trackGearRatio (Donington Park) The gear ratio for each gear
Extra tracks	Variable: trackGearPower (Donington Park) The power for each gear
Extra tracks	Variable: trackBaseSpeed (Donington Park) The base speed for each race class, used when generating the best racing lines and non-player driver speeds
Extra tracks	Variable: trackStartPosition (Donington Park) The starting race position of the player during a practice or qualifying lap
Extra tracks	Variable: trackCarSpacing (Donington Park) The spacing between the cars at the start of a qualifying lap, in segments
Extra tracks	Variable: trackTimerAdjust (Donington Park) Adjustment factor for the speed of the timers to allow for fine-tuning of time on a per-track basis
Extra tracks	Variable: trackRaceSlowdown (Donington Park) Slowdown factor for non-player drivers in the race
Extra tracks	Subroutine: HookFirstSegment (Donington Park) Move to the next to the next segment vector along the track and calculate the segment vector
Extra tracks	Subroutine: CallTrackHook (Donington Park) The track file's hook code
Extra tracks	Variable: trackChecksum (Donington Park) The track file's checksum
Extra tracks	Variable: trackGameName (Donington Park) The game name
Extra tracks	Variable: trackName (Donington Park) The track name

Oulton Park track data file
---------------------------

Category	Details
Extra tracks	Variable: Track section data (Part 1 of 2) (Oulton Park) Data for the track sections
Extra tracks	Subroutine: Hook80Percent (Oulton Park) Set the horizonTrackWidth to 80% of the width of the track on the horizon
Extra tracks	Subroutine: HookJoystick (Part 2 of 2) (Oulton Park) Apply enhanced joystick steering to specific track sections
Extra tracks	Variable: subSection (Oulton Park) The number of the current sub-section
Extra tracks	Variable: trackSubCount (Oulton Park) The total number of sub-sections in the track
Extra tracks	Variable: yawAngleLo (Oulton Park) Low byte of the current yaw angle of the track, i.e. the angle at which the track is pointing along the ground
Extra tracks	Variable: yawAngleHi (Oulton Park) High byte of the current yaw angle of the track, i.e. the angle at which the track is pointing along the ground
Extra tracks	Variable: segmentSlope (Oulton Park) The height above ground of the current track sub-section
Extra tracks	Variable: subSectionSegment (Oulton Park) The number of the segment within the current sub-section, counting from the start of the sub-section
Extra tracks	Variable: modifyAddressLo (Oulton Park) Low byte of the location in the main game code where we modify a two-byte address
Extra tracks	Variable: modifyAddressHi (Oulton Park) High byte of the location in the main game code where we modify a two-byte address
Extra tracks	Variable: trackYawDeltaHi (Oulton Park) High byte of the change in yaw angle that we apply to each segment in the specified sub-section when building the track
Track data	Variable: trackSignData (Oulton Park) Base coordinates and object types for 16 road signs
Extra tracks	Subroutine: CalcSegmentVector (Oulton Park) Calculate the segment vector for the current segment
Extra tracks	Subroutine: Multiply8x8Signed (Oulton Park) Multiply two 8-bit numbers, one of which is signed
Extra tracks	Subroutine: HookDataPointers (Oulton Park) If the current section is dynamically generated, update the data pointers
Extra tracks	Variable: newContentLo (Oulton Park) Low byte of the two-byte address that we want to poke into the main game code at the modify location
Extra tracks	Variable: newContentHi (Oulton Park) High byte of the two-byte address that we want to poke into the main game code at the modify location
Extra tracks	Variable: trackYawDeltaLo (Oulton Park) Low byte of the change in yaw angle that we apply to each segment in the specified sub-section when building the track
Extra tracks	Variable: xTrackSignVector (Oulton Park) The x-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookSegmentVector (Oulton Park) If the current section is dynamically generated, move to the next segment vector, calculate it and store it
Extra tracks	Subroutine: MoveToNextVector (Oulton Park) Move to the next to the next segment vector along the track and update the pointers
Extra tracks	Subroutine: UpdateDataPointers (Oulton Park) Update the sub-section and segment numbers to point to the next segment along the track in the correct direction
Extra tracks	Subroutine: HookMoveBack (Oulton Park) Only move the player backwards if the player has not yet driven past the segment
Extra tracks	Subroutine: SetSegmentVector (Oulton Park) Add the yaw angle and height deltas to the yaw angle and height (for curved sections) and calculate the segment vector
Extra tracks	Subroutine: ModifyGameCode (Part 3 of 3) (Oulton Park) Modify the game code to support the extra track data
Extra tracks	Variable: trackSlopeDelta (Oulton Park) The change in the slope (i.e. the change in the gradient) over the course of each segment for each sub-section of the track
Extra tracks	Variable: yTrackSignVector (Oulton Park) The y-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookSectionFrom (Oulton Park) Initialise and calculate the current segment vector
Extra tracks	Subroutine: HookUpdateHorizon (Oulton Park) Only update the horizon if we have found fewer than 12 visible segments
Extra tracks	Subroutine: HookFieldOfView (Oulton Park) When populating the verge buffer in GetSegmentAngles, don't give up so easily when we get segments outside the field of view
Extra tracks	Subroutine: HookFlattenHills (Oulton Park) Flatten any hills in the verge buffer, calculate the hill height and track width, cut objects off at the hill height
Extra tracks	Subroutine: ModifyGameCode (Part 1 of 3) (Oulton Park) Modify the game code to support the extra track data
Extra tracks	Variable: trackSubSize (Oulton Park) The size of each sub-section, i.e. the number of segments in each sub-section
Extra tracks	Variable: zTrackSignVector (Oulton Park) The z-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookFixHorizon (Oulton Park) Apply the horizon line in A instead of horizonLine
Extra tracks	Subroutine: HookJoystick (Part 1 of 2) (Oulton Park) Apply enhanced joystick steering to specific track sections
Extra tracks	Variable: xTrackCurve (Oulton Park) The x-coordinate of the tangent vector (i.e. the curve direction) at 64 points on a one-eighth circle covering 0 to 45 degrees
Extra tracks	Subroutine: ModifyGameCode (Part 2 of 3) (Oulton Park) Modify the game code to support the extra track data
Extra tracks	Variable: trackSlope (Oulton Park) The slope at the start of each track section
Extra tracks	Variable: trackYawAngleLo (Oulton Park) The low byte of the yaw angle of the start of each track section (i.e. the direction of the track at that point)
Extra tracks	Variable: trackYawAngleHi (Oulton Park) The high byte of the yaw angle of the start of each track section (i.e. the direction of the track at that point)
Extra tracks	Variable: trackSubConfig (Oulton Park) Configuration data for each section that defines the sub-section numbers, and horizon calculations
Extra tracks	Variable: trackSteering (Oulton Park) The optimum steering for non-player drivers on each track section
Extra tracks	Variable: zTrackCurve (Oulton Park) The z-coordinate of the tangent vector (i.e. the curve direction) at 64 points on a one-eighth circle covering 0 to 45 degrees
Extra tracks	Variable: Track section data (Part 2 of 2) (Oulton Park) Data for the track sections
Extra tracks	Subroutine: HookFlipAbsolute (Oulton Park) Set the sign of A according to the direction we are facing along the track
Extra tracks	Subroutine: HookSlopeJump (Oulton Park) Jump the car when driving fast over sloping segments
Extra tracks	Variable: trackSectionCount (Oulton Park) The total number of track sections * 8
Track data	Variable: trackVectorCount (Oulton Park) The total number of segment vectors in the segment vector tables
Track data	Variable: trackLength (Oulton Park) The length of the full track in terms of segments
Track data	Variable: trackStartLine (Oulton Park) The segment number of the starting line
Extra tracks	Variable: trackLapTimeSec (Oulton Park) Lap times for adjusting the race class (seconds)
Extra tracks	Variable: trackLapTimeMin (Oulton Park) Lap times for adjusting the race class (minutes)
Extra tracks	Variable: trackGearRatio (Oulton Park) The gear ratio for each gear
Extra tracks	Variable: trackGearPower (Oulton Park) The power for each gear
Extra tracks	Variable: trackBaseSpeed (Oulton Park) The base speed for each race class, used when generating the best racing lines and non-player driver speeds
Extra tracks	Variable: trackStartPosition (Oulton Park) The starting race position of the player during a practice or qualifying lap
Extra tracks	Variable: trackCarSpacing (Oulton Park) The spacing between the cars at the start of a qualifying lap, in segments
Extra tracks	Variable: trackTimerAdjust (Oulton Park) Adjustment factor for the speed of the timers to allow for fine-tuning of time on a per-track basis
Extra tracks	Variable: trackRaceSlowdown (Oulton Park) Slowdown factor for non-player drivers in the race
Extra tracks	Subroutine: HookFirstSegment (Oulton Park) Move to the next to the next segment vector along the track and calculate the segment vector
Extra tracks	Subroutine: CallTrackHook (Oulton Park) The track file's hook code
Extra tracks	Variable: trackChecksum (Oulton Park) The track file's checksum
Extra tracks	Variable: trackGameName (Oulton Park) The game name
Extra tracks	Variable: trackName (Oulton Park) The track name

Snetterton track data file
--------------------------

Category	Details
Extra tracks	Variable: Track section data (Part 1 of 2) (Snetterton) Data for the track sections
Extra tracks	Subroutine: Hook80Percent (Snetterton) Set the horizonTrackWidth to 80% of the width of the track on the horizon
Extra tracks	Subroutine: HookJoystick (Part 3 of 3) (Snetterton) Apply enhanced joystick steering to specific track sections
Extra tracks	Subroutine: HookFlattenHills (Part 2 of 2) (Snetterton) Flatten any hills in the verge buffer, calculate the hill height and track width, cut objects off at the hill height
Extra tracks	Variable: subSection (Snetterton) The number of the current sub-section
Extra tracks	Variable: trackSubCount (Snetterton) The total number of sub-sections in the track
Extra tracks	Variable: yawAngleLo (Snetterton) Low byte of the current yaw angle of the track, i.e. the angle at which the track is pointing along the ground
Extra tracks	Variable: yawAngleHi (Snetterton) High byte of the current yaw angle of the track, i.e. the angle at which the track is pointing along the ground
Extra tracks	Variable: segmentSlope (Snetterton) The height above ground of the current track sub-section
Extra tracks	Variable: subSectionSegment (Snetterton) The number of the segment within the current sub-section, counting from the start of the sub-section
Extra tracks	Variable: modifyAddressLo (Snetterton) Low byte of the location in the main game code where we modify a two-byte address
Extra tracks	Variable: modifyAddressHi (Snetterton) High byte of the location in the main game code where we modify a two-byte address
Extra tracks	Variable: trackYawDeltaHi (Snetterton) High byte of the change in yaw angle that we apply to each segment in the specified sub-section when building the track
Track data	Variable: trackSignData (Snetterton) Base coordinates and object types for 16 road signs
Extra tracks	Subroutine: CalcSegmentVector (Snetterton) Calculate the segment vector for the current segment
Extra tracks	Subroutine: Multiply8x8Signed (Snetterton) Multiply two 8-bit numbers, one of which is signed
Extra tracks	Subroutine: HookDataPointers (Snetterton) If the current section is dynamically generated, update the data pointers
Extra tracks	Variable: newContentLo (Snetterton) Low byte of the two-byte address that we want to poke into the main game code at the modify location
Extra tracks	Variable: newContentHi (Snetterton) High byte of the two-byte address that we want to poke into the main game code at the modify location
Extra tracks	Variable: trackYawDeltaLo (Snetterton) Low byte of the change in yaw angle that we apply to each segment in the specified sub-section when building the track
Extra tracks	Variable: xTrackSignVector (Snetterton) The x-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookSegmentVector (Snetterton) If the current section is dynamically generated, move to the next segment vector, calculate it and store it
Extra tracks	Subroutine: MoveToNextVector (Snetterton) Move to the next to the next segment vector along the track and update the pointers
Extra tracks	Subroutine: UpdateDataPointers (Snetterton) Update the sub-section and segment numbers to point to the next segment along the track in the correct direction
Extra tracks	Subroutine: HookMoveBack (Snetterton) Only move the player backwards if the player has not yet driven past the segment
Extra tracks	Subroutine: SetSegmentVector (Snetterton) Add the yaw angle and height deltas to the yaw angle and height (for curved sections) and calculate the segment vector
Extra tracks	Subroutine: ModifyGameCode (Part 3 of 3) (Snetterton) Modify the game code to support the extra track data
Extra tracks	Variable: trackSlopeDelta (Snetterton) The change in the slope (i.e. the change in the gradient) over the course of each segment for each sub-section of the track
Extra tracks	Variable: yTrackSignVector (Snetterton) The y-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookSectionFrom (Snetterton) Initialise and calculate the current segment vector
Extra tracks	Subroutine: HookUpdateHorizon (Snetterton) Only update the horizon if we have found fewer than 12 visible segments
Extra tracks	Subroutine: HookFieldOfView (Snetterton) When populating the verge buffer in GetSegmentAngles, don't give up so easily when we get segments outside the field of view
Extra tracks	Subroutine: HookFlattenHills (Part 1 of 2) (Snetterton) Flatten any hills in the verge buffer, calculate the hill height and track width, cut objects off at the hill height
Extra tracks	Subroutine: ModifyGameCode (Part 1 of 3) (Snetterton) Modify the game code to support the extra track data
Extra tracks	Variable: trackSubSize (Snetterton) The size of each sub-section, i.e. the number of segments in each sub-section
Extra tracks	Variable: zTrackSignVector (Snetterton) The z-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookFixHorizon (Snetterton) Apply the horizon line in A instead of horizonLine
Extra tracks	Subroutine: HookJoystick (Part 1 of 3) (Snetterton) Apply enhanced joystick steering to specific track sections
Extra tracks	Variable: xTrackCurve (Snetterton) The x-coordinate of the tangent vector (i.e. the curve direction) at 64 points on a one-eighth circle covering 0 to 45 degrees
Extra tracks	Subroutine: ModifyGameCode (Part 2 of 3) (Snetterton) Modify the game code to support the extra track data
Extra tracks	Variable: trackSlope (Snetterton) The slope at the start of each track section
Extra tracks	Variable: trackYawAngleLo (Snetterton) The low byte of the yaw angle of the start of each track section (i.e. the direction of the track at that point)
Extra tracks	Variable: trackYawAngleHi (Snetterton) The high byte of the yaw angle of the start of each track section (i.e. the direction of the track at that point)
Extra tracks	Variable: trackSubConfig (Snetterton) Configuration data for each section that defines the sub-section numbers, and horizon calculations
Extra tracks	Variable: trackSteering (Snetterton) The optimum steering for non-player drivers on each track section
Extra tracks	Variable: zTrackCurve (Snetterton) The z-coordinate of the tangent vector (i.e. the curve direction) at 64 points on a one-eighth circle covering 0 to 45 degrees
Extra tracks	Variable: Track section data (Part 2 of 2) (Snetterton) Data for the track sections
Extra tracks	Subroutine: HookFlipAbsolute (Snetterton) Set the sign of A according to the direction we are facing along the track
Extra tracks	Subroutine: HookSlopeJump (Snetterton) Jump the car when driving fast over sloping segments
Extra tracks	Subroutine: HookJoystick (Part 2 of 3) (Snetterton) Apply enhanced joystick steering to specific track sections
Extra tracks	Subroutine: HookBackground (Snetterton) Do not update the background colour when the track line above is showing green for the leftTrackStart verge
Extra tracks	Variable: trackSectionCount (Snetterton) The total number of track sections * 8
Track data	Variable: trackVectorCount (Snetterton) The total number of segment vectors in the segment vector tables
Track data	Variable: trackLength (Snetterton) The length of the full track in terms of segments
Track data	Variable: trackStartLine (Snetterton) The segment number of the starting line
Extra tracks	Variable: trackLapTimeSec (Snetterton) Lap times for adjusting the race class (seconds)
Extra tracks	Variable: trackLapTimeMin (Snetterton) Lap times for adjusting the race class (minutes)
Extra tracks	Variable: trackGearRatio (Snetterton) The gear ratio for each gear
Extra tracks	Variable: trackGearPower (Snetterton) The power for each gear
Extra tracks	Variable: trackBaseSpeed (Snetterton) The base speed for each race class, used when generating the best racing lines and non-player driver speeds
Extra tracks	Variable: trackStartPosition (Snetterton) The starting race position of the player during a practice or qualifying lap
Extra tracks	Variable: trackCarSpacing (Snetterton) The spacing between the cars at the start of a qualifying lap, in segments
Extra tracks	Variable: trackTimerAdjust (Snetterton) Adjustment factor for the speed of the timers to allow for fine-tuning of time on a per-track basis
Extra tracks	Variable: trackRaceSlowdown (Snetterton) Slowdown factor for non-player drivers in the race
Extra tracks	Subroutine: HookFirstSegment (Snetterton) Move to the next to the next segment vector along the track and calculate the segment vector
Extra tracks	Subroutine: CallTrackHook (Snetterton) The track file's hook code
Extra tracks	Variable: trackChecksum (Snetterton) The track file's checksum
Extra tracks	Variable: trackGameName (Snetterton) The game name
Extra tracks	Variable: trackName (Snetterton) The track name

Nürburgring track data file
---------------------------

Category	Details
Extra tracks	Variable: Track section data (Part 1 of 2) (Nürburgring) Data for the track sections
Extra tracks	Subroutine: HookFlattenHills (Part 2 of 3) (Nürburgring) Flatten any hills in the verge buffer, calculate the hill height and track width, cut objects off at the hill height
Extra tracks	Subroutine: HookMoveBack (Nürburgring) Only move the player backwards if the player has not yet driven past the segment
Extra tracks	Variable: subSection (Nürburgring) The number of the current sub-section
Extra tracks	Variable: trackSubCount (Nürburgring) The total number of sub-sections in the track
Extra tracks	Variable: yawAngleLo (Nürburgring) Low byte of the current yaw angle of the track, i.e. the angle at which the track is pointing along the ground
Extra tracks	Variable: yawAngleHi (Nürburgring) High byte of the current yaw angle of the track, i.e. the angle at which the track is pointing along the ground
Extra tracks	Variable: segmentSlope (Nürburgring) The height above ground of the current track sub-section
Extra tracks	Variable: subSectionSegment (Nürburgring) The number of the segment within the current sub-section, counting from the start of the sub-section
Extra tracks	Variable: modifyAddressLo (Nürburgring) Low byte of the location in the main game code where we modify a two-byte address
Extra tracks	Variable: modifyAddressHi (Nürburgring) High byte of the location in the main game code where we modify a two-byte address
Extra tracks	Variable: trackYawDeltaHi (Nürburgring) High byte of the change in yaw angle that we apply to each segment in the specified sub-section when building the track
Extra tracks	Subroutine: HookFieldOfView (Nürburgring) When populating the verge buffer in GetSegmentAngles, don't give up so easily when we get segments outside the field of view
Track data	Variable: trackSignData (Nürburgring) Base coordinates and object types for 16 road signs
Extra tracks	Subroutine: CalcSegmentVector (Nürburgring) Calculate the segment vector for the current segment
Extra tracks	Subroutine: HookDataPointers (Nürburgring) If the current section is dynamically generated, update the data pointers
Extra tracks	Subroutine: HookFlipAbsolute (Nürburgring) Set the sign of A according to the direction we are facing along the track
Extra tracks	Variable: newContentLo (Nürburgring) Low byte of the two-byte address that we want to poke into the main game code at the modify location
Extra tracks	Variable: newContentHi (Nürburgring) High byte of the two-byte address that we want to poke into the main game code at the modify location
Extra tracks	Variable: trackYawDeltaLo (Nürburgring) Low byte of the change in yaw angle that we apply to each segment in the specified sub-section when building the track
Extra tracks	Subroutine: Hook80Percent (Nürburgring) Set the horizonTrackWidth to 80% of the width of the track on the horizon
Extra tracks	Subroutine: Multiply8x8Signed (Nürburgring) Multiply two 8-bit numbers, one of which is signed
Extra tracks	Variable: xTrackSignVector (Nürburgring) The x-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookSegmentVector (Nürburgring) If the current section is dynamically generated, move to the next segment vector, calculate it and store it
Extra tracks	Subroutine: MoveToNextVector (Nürburgring) Move to the next to the next segment vector along the track and update the pointers
Extra tracks	Subroutine: UpdateDataPointers (Nürburgring) Update the sub-section and segment numbers to point to the next segment along the track in the correct direction
Extra tracks	Subroutine: SetSegmentVector (Nürburgring) Add the yaw angle and height deltas to the yaw angle and height (for curved sections) and calculate the segment vector
Extra tracks	Subroutine: ModifyGameCode (Part 3 of 3) (Nürburgring) Modify the game code to support the extra track data
Extra tracks	Variable: trackSlopeDelta (Nürburgring) The change in the slope (i.e. the change in the gradient) over the course of each segment for each sub-section of the track
Extra tracks	Subroutine: HookFlattenHills (Part 3 of 3) (Nürburgring) Flatten any hills in the verge buffer, calculate the hill height and track width, cut objects off at the hill height
Extra tracks	Variable: yTrackSignVector (Nürburgring) The y-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookSectionFrom (Nürburgring) Initialise and calculate the current segment vector
Extra tracks	Subroutine: HookJoystick (Part 2 of 2) (Nürburgring) Apply enhanced joystick steering to specific track sections
Extra tracks	Subroutine: HookFlattenHills (Part 1 of 3) (Nürburgring) Flatten any hills in the verge buffer, calculate the hill height and track width, cut objects off at the hill height
Extra tracks	Subroutine: ModifyGameCode (Part 1 of 4) (Nürburgring) Modify the game code to support the extra track data
Extra tracks	Variable: trackSubSize (Nürburgring) The size of each sub-section, i.e. the number of segments in each sub-section
Extra tracks	Subroutine: HookUpdateHorizon (Nürburgring) Only update the horizon if we have found fewer than 12 visible segments
Extra tracks	Variable: zTrackSignVector (Nürburgring) The z-coordinate of the track sign vector for each sign, to be scaled and added to the inner track section vector for the sign
Extra tracks	Subroutine: HookFixHorizon (Nürburgring) Apply the horizon line in A instead of horizonLine
Extra tracks	Subroutine: HookSlopeJump (Nürburgring) Jump the car when driving fast over sloping segments
Extra tracks	Variable: xTrackCurve (Nürburgring) The x-coordinate of the tangent vector (i.e. the curve direction) at 64 points on a one-eighth circle covering 0 to 45 degrees
Extra tracks	Subroutine: ModifyGameCode (Part 2 of 3) (Nürburgring) Modify the game code to support the extra track data
Extra tracks	Variable: trackSlope (Nürburgring) The slope at the start of each track section
Extra tracks	Variable: trackYawAngleLo (Nürburgring) The low byte of the yaw angle of the start of each track section (i.e. the direction of the track at that point)
Extra tracks	Variable: trackYawAngleHi (Nürburgring) The high byte of the yaw angle of the start of each track section (i.e. the direction of the track at that point)
Extra tracks	Variable: trackSubConfig (Nürburgring) Configuration data for each section that defines the sub-section numbers, and horizon calculations
Extra tracks	Variable: trackSteering (Nürburgring) The optimum steering for non-player drivers on each track section
Extra tracks	Variable: zTrackCurve (Nürburgring) The z-coordinate of the tangent vector (i.e. the curve direction) at 64 points on a one-eighth circle covering 0 to 45 degrees
Extra tracks	Variable: Track section data (Part 2 of 2) (Nürburgring) Data for the track sections
Extra tracks	Subroutine: HookJoystick (Part 1 of 2) (Nürburgring) Apply enhanced joystick steering to specific track sections
Extra tracks	Variable: trackSectionCount (Nürburgring) The total number of track sections * 8
Track data	Variable: trackVectorCount (Nürburgring) The total number of segment vectors in the segment vector tables
Track data	Variable: trackLength (Nürburgring) The length of the full track in terms of segments
Track data	Variable: trackStartLine (Nürburgring) The segment number of the starting line
Extra tracks	Variable: trackLapTimeSec (Nürburgring) Lap times for adjusting the race class (seconds)
Extra tracks	Variable: trackLapTimeMin (Nürburgring) Lap times for adjusting the race class (minutes)
Extra tracks	Variable: trackGearRatio (Nürburgring) The gear ratio for each gear
Extra tracks	Variable: trackGearPower (Nürburgring) The power for each gear
Extra tracks	Variable: trackBaseSpeed (Nürburgring) The base speed for each race class, used when generating the best racing lines and non-player driver speeds
Extra tracks	Variable: trackStartPosition (Nürburgring) The starting race position of the player during a practice or qualifying lap
Extra tracks	Variable: trackCarSpacing (Nürburgring) The spacing between the cars at the start of a qualifying lap, in segments
Extra tracks	Variable: trackTimerAdjust (Nürburgring) Adjustment factor for the speed of the timers to allow for fine-tuning of time on a per-track basis
Extra tracks	Variable: trackRaceSlowdown (Nürburgring) Slowdown factor for non-player drivers in the race
Extra tracks	Subroutine: HookFirstSegment (Nürburgring) Move to the next to the next segment vector along the track and calculate the segment vector
Extra tracks	Subroutine: CallTrackHook (Nürburgring) The track file's hook code
Extra tracks	Variable: trackChecksum (Nürburgring) The track file's checksum
Extra tracks	Variable: trackGameName (Nürburgring) The game name
Extra tracks	Variable: trackName (Nürburgring) The track name

Workspaces----------

Revs A------

Revs B------

Revs C------

Revs D------

Revs E------

Revs F------

Revs G------

Revs H------

Revs I------

Silverstone track data file---------------------------

Brands Hatch track data file----------------------------

Donington Park track data file------------------------------

Oulton Park track data file---------------------------

Snetterton track data file--------------------------

Nürburgring track data file---------------------------