mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-12-21 06:29:48 +00:00
116 lines
3.3 KiB
Plaintext
116 lines
3.3 KiB
Plaintext
|
|
||
|
|
; Atari 5200 "Hello World" sample code
|
||
|
|
; Written by Daniel Boris (danlb_2000@yahoo.com)
|
||
|
|
; Modified by Steven Hugg @8bitworkshop
|
||
|
|
; Assemble with DASM
|
||
|
|
|
||
|
|
processor 6502
|
||
|
|
|
||
|
|
include "atari5200.inc"
|
||
|
|
|
||
|
|
org $4000 ;Start of cartridge area
|
||
|
|
sei ;Disable interrupts
|
||
|
|
cld ;Clear decimal mode
|
||
|
|
Start
|
||
|
|
ldx #$00
|
||
|
|
lda #$00
|
||
|
|
crloop1
|
||
|
|
sta $00,x ;Clear zero page
|
||
|
|
sta $D400,x ;Clear ANTIC
|
||
|
|
sta $C000,x ;Clear GTIA
|
||
|
|
sta $E800,x ;Clear POKEY
|
||
|
|
dex
|
||
|
|
bne crloop1
|
||
|
|
ldy #$00 ;Clear Ram
|
||
|
|
lda #$02 ;Start at $0200
|
||
|
|
sta $81
|
||
|
|
lda #$00
|
||
|
|
sta $80
|
||
|
|
crloop2
|
||
|
|
lda #$00
|
||
|
|
crloop3
|
||
|
|
sta ($80),y ;Store data
|
||
|
|
iny ;Next byte
|
||
|
|
bne crloop3 ;Branch if not done page
|
||
|
|
inc $81 ;Next page
|
||
|
|
lda $81
|
||
|
|
cmp #$40 ;Check if end of RAM
|
||
|
|
bne crloop2 ;Branch if not
|
||
|
|
|
||
|
|
ldx #$2f
|
||
|
|
dlloop ;Create Display List
|
||
|
|
lda dlist,x ;Get byte
|
||
|
|
sta $1000,x ;Copy to RAM
|
||
|
|
dex ;next byte
|
||
|
|
bpl dlloop
|
||
|
|
|
||
|
|
lda #$03 ;point IRQ vector
|
||
|
|
sta $200 ;to BIOS routine
|
||
|
|
lda #$FC
|
||
|
|
sta $201
|
||
|
|
lda #$B8 ;point VBI vector
|
||
|
|
sta $202 ;to BIOS routine
|
||
|
|
lda #$FC
|
||
|
|
sta $203
|
||
|
|
lda #$B2 ;point Deferred VBI
|
||
|
|
sta $204 ;to BIOS routine
|
||
|
|
lda #$FC
|
||
|
|
sta $205
|
||
|
|
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
|
||
|
|
sta DLISTL
|
||
|
|
lda #$10
|
||
|
|
sta SDLSTH ;Shadow DLISTH
|
||
|
|
sta DLISTH
|
||
|
|
lda #$f8 ;Set Charcter Set Base
|
||
|
|
sta CHBASE
|
||
|
|
lda #$22 ;Enable DMA
|
||
|
|
sta SDMCTL ;Shadow DMACTL
|
||
|
|
lda #$40 ;Enable NMI
|
||
|
|
sta NMIEN
|
||
|
|
|
||
|
|
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 $46,$00,$18,$02 ;mode 6 @ $1800
|
||
|
|
.byte $41,$00,$10 ;JMP -> $1000
|
||
|
|
|
||
|
|
;Text data
|
||
|
|
org $b100
|
||
|
|
text1 .byte "Hello World! "
|
||
|
|
.byte $a1,$a2,$a3
|
||
|
|
.byte 0
|
||
|
|
|
||
|
|
org $bffd
|
||
|
|
.byte $FF ;Don't display Atari logo
|
||
|
|
.byte $00,$40 ;Start code at $4000
|
||
|
|
|