;license:MIT
;(c) 2020-2021 by qkumba

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

    !source "src/macros.a"

         +ENABLE_ACCEL
         lda   #<callback
         sta   $467F
         lda   #>callback
         sta   $4680
         jmp   $800       ; decompress

helper
         lda   $89A0
         cmp   #$CB       ; write file
         bne   nohelp
         lda   $8DB5      ; write address (low)
         cmp   #$F3       ; erasing save
         beq   nohelp
         cmp   #$F5       ; writing "valid"
         beq   nocall     ; ignore it
         cmp   #$5E       ; writing options
         beq   nohelp
         dec   $8DB5      ; write address (low)

nohelp
         jmp   $FDFD      ; SMC

nocall
         plp
         pla
         pla
         clc
         rts

callback
         jsr   $BE00
         lda   $BF0B
         sta   nohelp + 1
         lda   $BF0C
         sta   nohelp + 2
         lda   #<helper
         sta   $BF0B
         lda   #>helper
         sta   $BF0C
         +DISABLE_ACCEL
         rts

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