4cade/src/demo/repton.a

;license:MIT
;(c) 2021-2022 by Frank M., qkumba

!cpu 6502
!to "build/DEMO/REPTON#060200",plain
*=$200

         !source "src/constants.a"   ; no code in these
         !source "src/macros.a"

         +READ_RAM2_WRITE_RAM2
         +LOAD_FILE_KEEP_DIR repton, repton_dir_e-repton_dir_b
         lda   #$60
         sta   $086D
         jsr   $0800      ; decompress1

         lda   #$60
         sta   $BA18
         jsr   $BA03      ; decompress2

         ldx   #5-1
-        lda   patch1, x
         sta   $06A3, x   ; ($06A6 in notes, second byte of patch also changes to $13)
         dex
         bpl   -          ; exit when user presses any key

         ldx   #3-1
-        lda   patch2, x
         sta   $07A4, x
         dex
         bpl   -          ; exit at end of demo cycle

         jmp   $0767

patch1   !byte $10,$13
patch2   !byte $4C,$00,$01

repton   !byte repton_e-repton_b
repton_b
repton_dir_b
         !text "X"
repton_dir_e
         !text "/REPTON"
repton_e

!if * > $300 {
  !error "code is too large, ends at ", *
}