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54 lines
954 B
ArmAsm
54 lines
954 B
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 popa
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sta SCRX
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; Update adress video ram position when SCRY is modified (update_adscr)
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; Fall through
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.endproc
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.proc update_adscr
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lda #<SCREEN
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sta ADSCR
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lda #>SCREEN
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sta ADSCR+1
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ldy SCRY
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beq out
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loop:
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lda ADSCR
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clc
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adc #SCREEN_XSIZE
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bcc skip
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inc ADSCR+1
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skip:
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sta ADSCR
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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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