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cc65/libsrc/telestrat/gotoxy.s
2022-04-17 16:06:22 +02:00

54 lines
943 B
ArmAsm

;
; 2017-02-25, jede <jede@oric.org>
; 2017-06-15, Greg King
;
; void gotoxy (unsigned char x, unsigned char y);
;
.export gotoxy, _gotoxy, update_adscr
.import popa, OLD_CHARCOLOR, OLD_BGCOLOR
.include "telestrat.inc"
gotoxy: jsr popa ; Get Y
.proc _gotoxy
; This function moves only the display cursor; it does not move the prompt position.
; In telemon, there is a position for the prompt, and another for the cursor.
sta SCRY
jsr popa
sta SCRX
; Update address video ram position when SCRY is modified (update_adscr)
; Fall through
.endproc
.proc update_adscr
lda #<SCREEN
sta ADSCR
lda #>SCREEN
sta ADSCR+1
ldy SCRY
beq out
loop:
lda ADSCR
clc
adc #SCREEN_XSIZE
bcc skip
inc ADSCR+1
skip:
sta ADSCR
dey
bne loop
out:
rts
.endproc