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.include "atari.inc"
font = $9c00
CCNTL = $d500
destptr = FR0
srcptr = FR1
codedest = $0400
cart_trailer = $bffa
.org $a000 ; left cartridge
titledata:
.incbin "titledata.dat"
dlist:
; copy 7680 bytes from $8000-$9dff to (destptr).
; on exit, destptr points to the next 7680 byte chunk.
copy_30_pages:
lda #$0
tay
sta srcptr
lda #$80
sta srcptr+1
ldx #$1e
@copypage:
lda (srcptr),y
sta (destptr),y
dey
bne @copypage
inc srcptr+1
inc destptr+1
dex
bne @copypage
init:
rts
start:
; turn off ANTIC DMA to speed up copying to RAM
lda #0
sta SDMCTL
sta DMACTL
; copy code to RAM
lda #<codedest
sta destptr
lda #>codedest
sta destptr+1
lda #0 ; bank 0...
sta CCNTL ; ...select it
jsr copy_30_pages
lda #1 ; bank 1...
sta CCNTL ; ...select it
jsr copy_30_pages
lda #2 ; bank 2...
sta CCNTL ; ...select it
jsr copy_30_pages
lda #3 ; bank 3...
sta CCNTL ; ...select it
jsr copy_30_pages
; leave bank 3 enabled, as it has our custom font in it
; set up display list
lda #34
sta SDMCTL
lda #>font
sta CHBAS
;lda $ff
;sta CH
;@wait4key:
;cmp CH
;beq @wait4key
jsr $0400
.if * > cart_trailer
.fatal "bank7 code too large"
.endif
.res cart_trailer - *, $ff
.word start ; entry point
.byte 0 ; 0 = cartridge present
.byte 4 ; init and run the cart, don't boot the disk, non-diagnostic
.word init ; init address (just an RTS)
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