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27 lines
446 B
ArmAsm
27 lines
446 B
ArmAsm
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; Greg King, 10-Apr-2019
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.export _bgcolor
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.include "atari5200.inc"
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.data
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old_bg_index:
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.byte COLOR_BLACK ; see conioscreen.s for default palette
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.code
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_bgcolor:
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and #$03
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tax
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ldy COLOR0,x
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lda old_bg_index
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sty COLOR4 ; set new value
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stx old_bg_index
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ldx #0 ; fix high byte
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rts
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.end
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