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Exclusive OR X checks whether the state of the addressed bit is "1", and XORs the test result with the RLO. As muotioj states highlight the instruction and press F1 for help.
Posted
That appears to be the case. I wasn't 100% sure, so I made a quick test program and checked it out. If you add a call to FC0 in OB1, save OB1, and tell it to regenerate the call structure when you open it, the "X" should go away.

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