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B123: Paint Background Yellow
Used by the routine at Play_Window.
Input
HL Attribute buffer address
Paints two whole lines yellow, from a given attribute buffer address.
PaintYellow B123 LD B,$40 B=40 (counter).
PaintYellow_Loop B125 LD (HL),$30 Write 30 (INK: BLACK, PAPER: YELLOW ) to *HL.
B127 INC L Move onto the next attribute buffer column/ location.
B128 DJNZ PaintYellow_Loop Decrease counter by one and loop back to PaintYellow_Loop until counter is zero.
B12A RET Return.
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