Date   : Mon, 09 Sep 2002 00:10:37 +0100
From   : "Richard Gellman" <ricky@...>
Subject: 65C102 thousand dollar question

I'm having a problem with second processor emulation.

Something keeps trying to execute opcode &FC on a regular basis.

Unfortunately, this is not a valid opcode :)

&FC is NOP Abs,X on the 6502 (undocumented), but behaves differently on the
65C102.

I've tried a few tests, and with simple data in A, X, and Y, the instruction
doesn't seem to do anything.

Anyone got any ideas?

-- Richard