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60 lines
1.3 KiB
ArmAsm
60 lines
1.3 KiB
ArmAsm
;
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; 2017-02-25, jede <jede@oric.org>
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; 2017-06-15, Greg King
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;
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; void gotoxy (unsigned char x, unsigned char y);
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;
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.export gotoxy, _gotoxy, update_adscr
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.import popa, OLD_CHARCOLOR, OLD_BGCOLOR
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.include "telestrat.inc"
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gotoxy: jsr popa ; Get Y
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.proc _gotoxy
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; This function moves only the display cursor; it does not move the prompt position.
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; In telemon, there is a position for the prompt, and another for the cursor.
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sta SCRY
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jsr update_adscr ; Update adress video ram position when SCRY is modified
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jsr popa
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sta SCRX
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rts
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.endproc
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.proc update_adscr
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; Force to set again color if cursor moves
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; $FF is used because we know that it's impossible to have this value with a color
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; It prevents a bug : If bgcolor or textcolor is set to black for example with no char displays,
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; next cputsxy will not set the attribute if y coordinate changes
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lda #$FF
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sta OLD_CHARCOLOR
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sta OLD_BGCOLOR
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lda #<SCREEN
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sta ADSCRL
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lda #>SCREEN
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sta ADSCRH
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ldy SCRY
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beq out
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loop:
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lda ADSCRL
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clc
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adc #$28
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bcc skip
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inc ADSCRH
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skip:
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sta ADSCRL
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dey
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bne loop
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out:
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rts
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.endproc
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