mirror of
https://github.com/cc65/cc65.git
synced 2024-12-30 20:29:25 +00:00
84 lines
2.0 KiB
ArmAsm
84 lines
2.0 KiB
ArmAsm
; setup default CONIO screen (20x24, Antic mode 6, BASIC mode 1)
|
|
;
|
|
; 28-May-2014, Christian Groessler <chris@groessler.org>
|
|
|
|
.include "atari5200.inc"
|
|
|
|
SCREEN_BUF_SIZE = 20 * 24
|
|
SCREEN_BUF = $4000 - SCREEN_BUF_SIZE
|
|
|
|
.code
|
|
.export screen_setup_20x24
|
|
|
|
screen_setup_20x24:
|
|
|
|
; initialize SAVMSC
|
|
lda #<SCREEN_BUF
|
|
sta SAVMSC
|
|
lda #>SCREEN_BUF
|
|
sta SAVMSC+1
|
|
|
|
; initialize cursor position
|
|
lda #0
|
|
sta COLCRS_5200
|
|
sta ROWCRS_5200
|
|
|
|
; clear screen buffer
|
|
ldy #<(SCREEN_BUF_SIZE-1)
|
|
ldx #>(SCREEN_BUF_SIZE-1)
|
|
clrscr: sta (SAVMSC),y
|
|
dey
|
|
cpy #$FF
|
|
bne clrscr
|
|
dex
|
|
cpx #$FF
|
|
bne clrscr
|
|
|
|
; set default colors
|
|
|
|
lda #40
|
|
sta COLOR0
|
|
lda #202
|
|
sta COLOR1
|
|
lda #148
|
|
sta COLOR2
|
|
lda #70
|
|
sta COLOR3
|
|
lda #0
|
|
sta COLOR4
|
|
|
|
; set display list
|
|
|
|
lda #<dlist
|
|
sta SDLSTL
|
|
lda #>dlist
|
|
sta SDLSTH
|
|
|
|
rts
|
|
|
|
|
|
.segment "RODATA"
|
|
|
|
; display list for 20x24 text mode
|
|
|
|
dlist: .repeat 3
|
|
.byte DL_BLK8
|
|
.endrepeat
|
|
|
|
.byte DL_CHR20x8x2 | DL_LMS
|
|
.word SCREEN_BUF
|
|
|
|
.repeat 23
|
|
.byte DL_CHR20x8x2
|
|
.endrepeat
|
|
|
|
.byte DL_JVB
|
|
.word dlist
|
|
|
|
; end of display list
|
|
|
|
.assert ((* >> 10) = (dlist >> 10)), error, "Display list crosses 1K boundary"
|
|
|
|
|
|
.end
|