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25 lines
518 B
ArmAsm
25 lines
518 B
ArmAsm
;====================
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; lookup_map
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;====================
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; finds value in space_x.i,space_y.i
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; returns color in A
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; CLOBBERS: A,Y
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lda SPACEX_I ; 3
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sta spacex_label+1 ; self modifying code, LAST_SPACEX_I ; 4
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lda SPACEY_I ; 3
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sta spacey_label+1 ; self modifying code, LAST_SPACEY_I ; 4
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lda SPACEX_I
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and #$f
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sta TEMP
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asl
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asl
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asl
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asl
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ora TEMP
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eor SPACEY_I
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sta map_color_label+1 ; self-modifying
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