;license:MIT
;(c) 2024 by qkumba

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

    !source "src/prelaunch/common.a"

         +ENABLE_ACCEL
         lda   #$60
         sta   $813
         jsr   $800       ; decompress
         lda   $BF0B
         sta   nohelp + 1
         lda   $BF0C
         sta   nohelp + 2
         lda   #<helper
         sta   $BF0B
         lda   #>helper
         sta   $BF0C
         +DISABLE_ACCEL
         jmp   $4000

helper
         lda   $9F4C
         cmp   #$CB       ; write file
         bne   nohelp
         lda   $A50D      ; write address (low)
         cmp   #$EE       ; erasing save
         beq   nohelp
         cmp   #$F3       ; writing "valid"
         beq   nocall     ; ignore it
         cmp   #$F7       ; writing options
         beq   nohelp
         inc   $A053      ; mark save valid
         dec   $A50D      ; write address (low)
         inc   $A50F      ; increase size

nohelp
         jmp   $FDFD      ; SMC

nocall
         plp
         pla
         pla
         clc
         rts

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