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37 lines
637 B
ArmAsm
37 lines
637 B
ArmAsm
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; Christian Groessler, 05-Apr-2019
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.export _bgcolor
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.include "atari5200.inc"
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.constructor init_old_bgcolor
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.bss
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old_bg_color:
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.res 1
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.code
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_bgcolor:
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and #3
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tax
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lda COLOR0,x
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ldx old_bg_color
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sta COLOR4 ; set new value
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sta old_bg_color
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txa
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ldx #0 ; fix X
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rts
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.segment "ONCE"
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init_old_bgcolor:
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lda COLOR0+3 ; see also conioscreen.s for initialization
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sta old_bg_color
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rts
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.end
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