mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-25 18:33:11 +00:00
81 lines
2.2 KiB
Plaintext
81 lines
2.2 KiB
Plaintext
|
|
; Atari 8-bit "Hello World" sample code
|
|
; Written by Daniel Boris (danlb_2000@yahoo.com)
|
|
; Modified by Steven Hugg @8bitworkshop
|
|
; Assemble with DASM
|
|
;
|
|
|
|
processor 6502
|
|
|
|
include "atari.inc"
|
|
|
|
org $a000 ;Start of left cartridge area
|
|
Start
|
|
ldx #(dlistend-dlist)
|
|
dlloop ;Create Display List
|
|
lda dlist,x ;Get byte
|
|
sta $1000,x ;Copy to RAM
|
|
dex ;next byte
|
|
bpl dlloop
|
|
|
|
lda #$06
|
|
sta CHACTL ;Set Character Control
|
|
lda #$84 ;Set color PF2
|
|
sta COLOR0+2
|
|
sta COLOR0+4 ; bakground
|
|
lda #$0F ;Set color PF1
|
|
sta COLOR0+1
|
|
lda #$3f
|
|
sta COLOR0+0
|
|
lda #$58
|
|
sta COLOR0+3
|
|
lda #$00 ;Set Display list pointer
|
|
sta SDLSTL ;Shadow DLISTL
|
|
lda #$10
|
|
sta SDLSTH ;Shadow DLISTH
|
|
lda #$e0 ;Set Charcter Set Base
|
|
sta CHBAS
|
|
lda #$22 ;Enable DMA
|
|
sta SDMCTL ;Shadow DMACTL
|
|
|
|
print
|
|
ldy #$00
|
|
cld
|
|
prloop
|
|
lda text1,y ;Get character
|
|
beq wait
|
|
cmp #$60
|
|
bcs lower
|
|
sec
|
|
sbc #$20 ;Convert to ATASCII
|
|
lower
|
|
sta $1800,y ;Store in video memory
|
|
iny ;Next character
|
|
bne prloop
|
|
wait
|
|
nop
|
|
jmp wait
|
|
|
|
;Display list data (starts at $1000)
|
|
dlist .byte $70,$70,$70 ;24 blank scanlines
|
|
.byte $42,$00,$18,$02 ;mode 2 @ $1800
|
|
.byte $43,$00,$18,$02 ;mode 3 @ $1800
|
|
.byte $44,$00,$18,$02 ;mode 4 @ $1800
|
|
.byte $45,$00,$18,$02 ;mode 5 @ $1800
|
|
.byte $46,$00,$18,$06 ;mode 6 @ $1800
|
|
.byte $47,$00,$18,$06 ;mode 7 @ $1800
|
|
.byte $41,$00,$10 ;JMP -> $1000
|
|
dlistend
|
|
|
|
;Text data
|
|
text1 .byte "Hello World! "
|
|
.byte $a1,$a2,$a3
|
|
.byte 0
|
|
|
|
;Cartridge footer
|
|
org CARTCS
|
|
.word Start ; cold start address
|
|
.byte $00 ; 0 == cart exists
|
|
.byte $04 ; boot cartridge
|
|
.word Start ; start
|