Routines
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6F0A: Change Matching Colour Bits
Used by the routine at ChangeInkAndPaperColour.
Walks the attribute buffer. Wherever the bits selected by B equal C, those bits are replaced with L and the bits in H are kept.
ChangeMatchingColourBits 6F0A PUSH IX
6F0C LD IX,$6C7A
6F10 LD DE,$0180
ChangeMatchingColourBits_0 6F13 LD A,(IX+$00)
6F16 AND B
6F17 CP C
6F18 JR NZ,ChangeMatchingColourBits_1
6F1A LD A,(IX+$00)
6F1D AND H
6F1E OR L
6F1F LD (IX+$00),A
ChangeMatchingColourBits_1 6F22 INC IX
6F24 DEC DE
6F25 LD A,D
6F26 OR E
6F27 JR NZ,ChangeMatchingColourBits_0
6F29 POP IX
6F2B RET
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