$E9C0/59840:   Read IEEE port

Jump from $E9C6, $E919, $E928, $E93A, $E944, $E951, $E95C, $E98A, $E9D0,
          $E9E9, $EA00, $EA1D:

E9C0: AD 00 18  LDA $1800       ; read port
E9C3: CD 00 18  CMP $1800       ; wait for constants
E9C6: D0 F8     BNE $E9C0
E9C8: 60        RTS

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