4cade/src/prelaunch/willy.byte.a

;license:MIT
;(c) 2021-2022 by qkumba

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

    !source "src/prelaunch/common.a"

         +ENABLE_ACCEL
         lda   #$60
         sta   $426B
         jsr   $4000      ; decompress
         lda   #<callback1
         sta   $BD7C
         lda   #>callback1
         sta   $BD7D
         lda   #$20
         sta   $7852
         lda   #<callback2
         sta   $7853
         lda   #>callback2
         sta   $7854
         lda   #$EA
         sta   $7855
         lda   #$4C
         sta   $B6D8
         ldx   #0
         stx   $B6D9
         inx
         stx   $B6DA      ; reset vector
         +DISABLE_ACCEL
         jmp   $6000

callback1
         +ENABLE_ACCEL
         jsr   $BD80      ; decompress
         +DISABLE_ACCEL
         lda   #0         ; set Z
         rts

callback2
         sbc   $8A
         cmp   #8
         beq   +
         cmp   #9
+        rts

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