mirror of
https://github.com/cc65/cc65.git
synced 2024-12-26 08:32:00 +00:00
77 lines
1.2 KiB
ArmAsm
77 lines
1.2 KiB
ArmAsm
|
;
|
||
|
|
; Ullrich von Bassewitz, 28.09.1998
|
||
|
|
;
|
||
|
|
; PLOT routine for the 610.
|
||
|
|
;
|
||
|
|
|
||
|
|
.export k_plot
|
||
|
|
.importzp crtc
|
||
|
|
|
||
|
|
.include "zeropage.inc"
|
||
|
|
|
||
|
|
|
||
|
|
.proc k_plot
|
||
|
|
|
||
|
|
bcc set
|
||
|
|
ldx CURS_Y
|
||
|
|
ldy CURS_X
|
||
|
|
rts
|
||
|
|
|
||
|
|
set: stx CURS_Y
|
||
|
|
sty CURS_X
|
||
|
|
lda LineLSBTab,x
|
||
|
|
sta CharPtr
|
||
|
|
lda LineMSBTab,x
|
||
|
|
sta CharPtr+1
|
||
|
|
|
||
|
|
lda IndReg
|
||
|
|
pha
|
||
|
|
lda #$0F
|
||
|
|
sta IndReg
|
||
|
|
|
||
|
|
ldy #$00
|
||
|
|
clc
|
||
|
|
sei
|
||
|
|
sta (crtc),y
|
||
|
|
lda CharPtr
|
||
|
|
adc CURS_X
|
||
|
|
iny
|
||
|
|
sta (crtc),y
|
||
|
|
dey
|
||
|
|
lda #$0E
|
||
|
|
sta (crtc),y
|
||
|
|
iny
|
||
|
|
lda (crtc),y
|
||
|
|
and #$F8
|
||
|
|
sta sedt1
|
||
|
|
lda CharPtr+1
|
||
|
|
adc #$00
|
||
|
|
and #$07
|
||
|
|
ora sedt1
|
||
|
|
sta (crtc),y
|
||
|
|
cli
|
||
|
|
|
||
|
|
pla
|
||
|
|
sta IndReg
|
||
|
|
rts
|
||
|
|
.endproc
|
||
|
|
|
||
|
|
; -------------------------------------------------------------------------
|
||
|
|
; Low bytes of the start address of the screen lines
|
||
|
|
|
||
|
|
.rodata
|
||
|
|
|
||
|
|
LineLSBTab:
|
||
|
|
.byte $00,$50,$A0,$F0,$40,$90,$E0,$30
|
||
|
|
.byte $80,$D0,$20,$70,$C0,$10,$60,$B0
|
||
|
|
.byte $00,$50,$A0,$F0,$40,$90,$E0,$30
|
||
|
|
.byte $80
|
||
|
|
; -------------------------------------------------------------------------
|
||
|
|
; High bytes of the start address of the screen lines
|
||
|
|
|
||
|
|
LineMSBTab:
|
||
|
|
.byte $D0,$D0,$D0,$D0,$D1,$D1,$D1,$D2
|
||
|
|
.byte $D2,$D2,$D3,$D3,$D3,$D4,$D4,$D4
|
||
|
|
.byte $D5,$D5,$D5,$D5,$D6,$D6,$D6,$D7
|
||
|
|
.byte $D7
|