Routines
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B873: Routine at B873
Used by the routine at B81C.
B873 LD L,(IX+$00)
B876 LD H,(IX+$01)
B879 LD A,H
B87A OR L
B87B RET Z
B87C LD A,(HL)
B87D INC HL
B87E LD H,(HL)
B87F LD L,A
B880 LD A,H
B881 RLCA
B882 RLCA
B883 RLCA
B884 AND %11111000 Keep only bits 3-7.
B886 LD H,A
B887 LD A,E
B888 SUB (IX+$02)
B88B JP P,$B8A7
B88E CPL
B88F CP C
B890 JR NC,$B89D
B892 LD A,D
B893 SUB L
B894 SUB (IX+$03)
B897 JP P,$B8AA
B89A CPL
B89B CP L
B89C RET C
B89D INC IX
B89F INC IX
B8A1 INC IX
B8A3 INC IX
B8A5 JR $B873
B8A7 CP H
B8A8 JR $B890
B8AA CP B
B8AB JR $B89C
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