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cc65/libsrc/atari5200/cvline.s
Christian Groessler ec5e38617a atari5200: implement bgcolor() and textcolor()
Includes some other small fixes/cleanups.
2019-04-12 12:49:38 +02:00

32 lines
907 B
ArmAsm

;
; Ullrich von Bassewitz, 08.08.1998
;
; void cvlinexy (unsigned char x, unsigned char y, unsigned char length);
; void cvline (unsigned char length);
;
.include "atari5200.inc"
.export _cvlinexy, _cvline
.import gotoxy, putchar
.importzp tmp1
_cvlinexy:
pha ; Save the length
jsr gotoxy ; Call this one, will pop params
pla ; Restore the length and run into _cvline
_cvline:
cmp #0 ; Is the length zero?
beq L9 ; Jump if done
sta tmp1
L1: lda COLCRS_5200
pha
lda #CH_VLINE ; Vertical bar
jsr putchar ; Write, no cursor advance
pla
sta COLCRS_5200
inc ROWCRS_5200
dec tmp1
bne L1
L9: rts