4cade/src/prelaunch/ghostbusters.a

;license:MIT
;(c) 2020, 2022 by qkumba

!cpu 6502
!to "build/PRELAUNCH.INDEXED/GHOSTBUSTERS",plain
*=$106

    !source "src/macros.a"

         +ENABLE_ACCEL
         lda   #$60
         sta   $4075
         jsr   $4000      ; decompress
         +READ_RAM2_NO_WRITE
         lda   MachineStatus
         and   #CHEATS_ENABLED
         beq   +
         lda   #<callback
         sta   $914
         lda   #>callback
         sta   $915
+
         jsr   DisableAccelerator
         +READ_ROM_NO_WRITE
         jmp   $800

callback
         lda   #0
         sta   $9D31      ; patch - disable sprite collision
         jmp   $9600

!if * > $1C0 {
  !error "code is too large, ends at ", *
}