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⌂ ∞ Revs on the BBC Micro

Extra tracks: HookJoystick (Part 2 of 3)

       Name: HookJoystick (Part 2 of 3)                              [Show more]
       Type: Subroutine
   Category: Extra tracks
    Summary: Apply enhanced joystick steering to specific track sections
  Deep dive: Secrets of the extra tracks
             Code hooks in the extra tracks

    Context: See this subroutine in context in the source code
 References: No direct references to this subroutine in this source file




.joys3

 LDY #181               \ Set Y = 181 so by default we scale the steering by
                        \ 1.00

 CMP #160               \ If the track section = 160 (i.e. section 20), jump to
 BEQ joys4              \ joys4 to scale the steering by 1.16

 CMP #168               \ If the track section <> 168 (i.e. section 21), jump to
 BNE joys5              \ joys5 to keep checking

 LSR playerDrift        \ Clear bit 7 of playerDrift to denote that the player
                        \ is not drifting sideways (i.e. cancel any drift)

.joys4

 LDY #195               \ Set Y = 195 so we scale the steering by 1.16

.joys5

 JMP joys6              \ Jump to part 3 to scale the steering