62 lines
945 B
ArmAsm
62 lines
945 B
ArmAsm
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; Ullrich von Bassewitz, 06.08.1998
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; Adapted for Vic20 by Steve Schmidtke 05.08.2002
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;
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; unsigned char __fastcall__ textcolor (unsigned char color);
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; unsigned char __fastcall__ bgcolor (unsigned char color);
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; unsigned char __fastcall__ bordercolor (unsigned char color);
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;
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.export _textcolor, _bgcolor, _bordercolor
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.include "vic20.inc"
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.bss
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clr_tmp: .res 1 ; tempory storage for bitfield ops
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.code
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_textcolor:
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ldx CHARCOLOR ; get old value
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sta CHARCOLOR ; set new value
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txa
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rts
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_bgcolor:
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asl
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asl
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asl
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asl
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sei ; don't want anything messing around while we update
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sta clr_tmp
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lda VIC_COLOR ; get old value
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and #$0F
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tax
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ora clr_tmp
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sta VIC_COLOR ; set new value
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cli
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txa
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lsr
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lsr
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lsr
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lsr
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rts
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_bordercolor:
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and #$07
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sei ; don't want anything messing around while we update
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sta clr_tmp
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lda VIC_COLOR ; get old value
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and #$F8
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tax
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ora clr_tmp
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sta VIC_COLOR ; set new value
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cli
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txa
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rts
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