Extra tracks: ModifyGameCode (Part 3 of 4)

       Name: ModifyGameCode (Part 3 of 4)                            [Show more]
       Type: Subroutine
   Category: Extra tracks
    Summary: Modify the game code to support the extra track data
    Context: See this subroutine in context in the source code
 References: No direct references to this subroutine in this source file


 The code modifications are done in four parts.

 This is also where the zTrackSegmentI table is built, once the modifications
 have been done. The routine is padded out to be exactly 40 bytes long, so
 there's one byte for each inner segment z-coordinate.


.mods3

 LDA #LO(HookForward)   \ !&24DF = HookForward (address in a JSR
 STA &24DF              \          instruction)
 LDA #HI(HookForward)
 STA &24E0

 LDA #LO(HookSlopeJump) \ !&45CC = HookSlopeJump (address in a JSR instruction)
 STA &45CC
 LDA #HI(HookSlopeJump)
 STA &45CD

 LDA #75                \ ?&2772 = 75 (argument in a CMP #75 instruction)
 STA &2772

 LDA #&A9               \ !&1310 = &A9 &88 (LDA #17*8 instruction)
 STA &1310
 LDA #&88
 STA &1311

 LDA #22                \ Set A = 22 to pass to part 4

 JMP mods4              \ Jump to part 4