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8B73: Routine at 8B73
Used by the routines at 970E, A579, A73C, A7E2 and B218.
8B73 CALL $8B52
8B76 EXX
8B77 CALL $8AF7
8B7A EXX
8B7B LD A,($5E56)
8B7E SUB (IX+$04)
8B81 JP Z,$8A76
8B84 JP M,$8B96
8B87 LD C,A
8B88 LD A,($5E5A)
8B8B CP C
8B8C JP C,$8A76
8B8F SUB C
8B90 LD ($5E5A),A
8B93 JP $8A5C
8B96 EXX
8B97 NEG
8B99 LD C,A
8B9A LD A,($5E59)
8B9D CP C
8B9E JP C,$8A75
8BA1 SUB C
8BA2 JP $8A89
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