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42865: Routine at A771
42865 PUSH IX Stash IX on the stack.
42867 CALL 42604 Call 42604.
42870 EX DE,HL Exchange the DE and HL registers.
42871 LD A,L Call 42436 if HL is not zero.
42872 OR H
42873 CALL NZ,42436
42876 POP IX Restore IX from the stack.
42878 XOR A A=0.
42879 RET Return.
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