Re: ROM 3 //gs issues

[Nels Bruckner <nelsb@comcast.net>]

On Sep 6, 2:33 pm, Linards Ticmanis <ticma...@gmx.de> wrote:
> Nels Bruckner wrote:
> > The next thing I could try is swapping in a second set of ROM 3 ROM
> > chips, which I don't have.  My usualy saviors in this kind of
> > situation, Reactive Micro, don't seem to carry ROM 3 replacements.
> > Any suggestions?
>
> On an 8-bit Apple I'd just write and run a quick Applesoft program to
> checksum the ROM (sum or EOR of all bytes), test it on an emulator and
> on the real system and see if the results differ.
>
> I don't know the IIgs well enough to know whether the entire ROM is
> readable from Applesoft. You might need assembly, but I assume it would
> be short enough to just enter from the CALL -151 monitor.
>
> --
> Linards Ticmanis

     Could certainly do that, but whether pass or fail it wouldn't
give me much new info.

     I did discover that the application failures I was seeing were
because (duh) I hadn't installed a RAM card in this machine.  Now that
the machine has 2MB of RAM it runs Dungeon Master, etc, just fine.
Which really just leaves me with the curious fact that the diagnostic
software reports a failure of the CPU/ROM validation step, since the
machine seems to function just fine.  I'm keeping my eyes open for a
second, dirt cheap ROM 3 machine (I think I got this one for $20+p/h)
to swap ROMS with but, in the meantime, anyone know where I can pick
up a set of ROM 3 chips?

     Thanks.

     --Nels