65C02 unused opcodes (what they do)

[mfischer@isca.uiowa.edu (Matthew Fischer)]

In case you're interested in exactly what the unused opcodes do, here's 
what the NCR data sheet says:

All are NOPs (reserved for future use).

Op Code          Bytes   Cycles
X2                 2       2
X3, X7, XB, XF     1       1
44                 2       3
54, D4, F4         2       4
5C                 3       8
DC, FC             3       4