;license:MIT
;(c) 2021 by qkumba

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

    !source "src/macros.a"

         jmp   main

callback2
         jsr   $BD5F
         jsr   $BD09
         lda   $B7EC
         cmp   #$10
         bne   +
         lda   $B7ED
         cmp   #9
         bne   +
         lda   #$AD
         sta   $159F
         sta   $15C3
+        pla
         pla
         clc
         rts

main
         +ENABLE_ACCEL
         +USES_TEXT_PAGE_2
         lda   #$60
         sta   $9EF
         jsr   $800        ; find and load "DOS"
         lda   #<callback1
         sta   $B748
         lda   #>callback1
         sta   $B749
         jmp   $B700

callback1
         ldx   #$00
         stx   $9E52
         inx
         stx   $9E53
         +GET_MACHINE_STATUS
         and   #CHEATS_ENABLED
         beq   +
         lda   #<callback2
         sta   $BD07
         lda   #>callback2
         sta   $BD08
+
         +DISABLE_ACCEL
         jmp   $9D84

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