Re: Rom 1 or Woz IIgs

[dempson@actrix.gen.nz (David Empson)]

Mitchell Spector <spec@vax2.concordia.ca> wrote:

> In article Stephen Banchich <banchich@earthlink.net> writes...
> 
> >Does anyone know if the Electronic Arts game One on One(Byrd vs. Irving)
> >will boot up on a Rom 1 or Woz edition Apple IIgs. I know it won't boot
> >up on a Rom 3. Thanks, Steve.
> 
>     Nope, Electronic Arts' "One on One" happens to be one of the 
> few 8-bit titles that are incompatible with the IIgs. I made up
> a list of incompatible IIgs software titles about a decade ago
> (not complete, only things I happened to come across) and having
> just dug it up, here is what I jotted down:
> 
> - Logo

Specifically the original Apple Logo.  It can be patched to disable the
copy protection, fixing the problem.  (It fails to run because it uses
an "illegal" 6502 instruction, which has undocumented but well-defined
behaviour; this instrution does something completely different on later
processors.)

I think Apple Logo II works on the IIgs, but I barely used it.

> - Karateka

Only the cracked version fails on the IIgs.  It is dependent on the
exact code in the Disk ][ controller (I was able to get it working by
incorporating a copy of the Disk ][ firmware into it).  The original one
apparently works fine.

I can't comment on any of the others.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand