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31 lines
734 B
ArmAsm
31 lines
734 B
ArmAsm
;
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; 2009-09-07, Ullrich von Bassewitz
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; 2019-09-23, Greg King
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;
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; unsigned __fastcall__ videomode (unsigned Mode);
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; /* Set the video mode, return the old mode. */
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;
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.export _videomode
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.import SWAPPER
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.include "cx16.inc"
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.proc _videomode
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cmp LLEN ; Do we have this mode already?
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beq @L9
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lda LLEN ; Get current mode ...
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pha ; ... and save it
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jsr SWAPPER ; Toggle the mode
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pla ; Get old mode into A
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; Done, old mode is in .A
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@L9: ldx #>$0000 ; Clear high byte
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rts
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.endproc
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