Er, it should be "prefix byte 0DDH or 0FDH", not "prefix byte 0DDH or 0FFH"=
..

Sorry,

~ Bob Ammerman
RAm Systems

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Bob Ammerman
Sent: Saturday, August 16, 2014 9:05 AM
To: 'Microcontroller discussion list - Public.'
Subject: RE: [EE] Z80 dis-assembly assembly - preferred tools

It's pretty easy to deal with errors from IXL, IXH, IYL, IYH. All you have
to do is use a prefix byte 0DDH or 0FFH in front of a normal instruction an=
d
the assembler will be happy:

USEIX EQU 0DDH
USEIY EQU 0FDH

Then replace something like: =20

	LD A,IXL

With:

	DB USEIX
	LD A,L

~ Bob Ammerman
RAm Systems

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Justin Richards
Sent: Saturday, August 16, 2014 6:29 AM
To: Microcontroller discussion list - Public.
Subject: [EE] Z80 dis-assembly assembly - preferred tools

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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