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About all CONIO functions offering a <...>xy variant call popa _gotoxy By providing an internal gotoxy variant that starts with a popa all those CONIO function can be shortened by 3 bytes. As soon as program calls more than one CONIO function this means an overall code size reduction.
21 lines
492 B
ArmAsm
21 lines
492 B
ArmAsm
;
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; copied from CBM implementation
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;
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; originally by:
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; Ullrich von Bassewitz, 06.08.1998
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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
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.import popa, plot
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.include "extzp.inc"
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gotoxy:
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jsr popa ; Get Y
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_gotoxy:
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sta CURS_Y ; Set Y
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jsr popa ; Get X
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sta CURS_X ; Set X
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jmp plot ; Set the cursor position
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