Nostalgic exploration of old arcade machines machines has resulted in the
acquisition of a couple of arcade machines and additional Galaga game
boards.

I have followed some of the work others have done dissecting the code and
now would like to experiment.

I downloaded an assembler/dis-assembler.  After some trial and error the
dis-assembled code when re-assembled now only throws 5 errors complaining
about 'bad register - ixl'.  (I was expecting this part of the procedure to
be straight forward especially as the assembler/dis-assembler are part of
the same installer.)

I assume this relates to undocumented instructions.  I am new to Z80
assembler and have a little exposure to 8080 and PIC assembler.

Rather than downloading and trying dis-assmbler/assembler pairs I thought I
would ask the list if they have any favorites that work well for them.

I am running xp.

Justin
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