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B187: Routine at B187
Used by the routine at B01A.
B187 LD A,($96AD) A=96AD.
B18A NEG
B18C DEC A
B18D LD E,A
B18E LD A,(IX+$01)
B191 LD C,A
B192 DEC A
This entry point is used by the routine at B19F.
B193 AND %00001111 Keep only bits 0-3.
B195 LD B,A
B196 LD A,C
B197 AND %11110000 Keep only bits 4-7.
B199 OR B
B19A LD (IX+$01),A
B19D JR $B148 Jump to B148.
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