Routines
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D7A2: Colour in a sprite horizontally
Used by the routine at D732.
Input
IY Pointer to the sprite attribute data
D current column to draw
D7A2 LD E,(IY+$00) Get the fixed row.
D7A5 CALL $E8E3 Convert this to an attribute address.
D7A8 EX DE,HL Swap DE and HL.
D7A9 LD DE,$0020
D7AC LD A,($D72E)
D7AF LD B,A
D7B0 LD A,$45
D7B2 LD (HL),A
D7B3 ADD HL,DE
D7B4 DJNZ $D7B2
D7B6 RET
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