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ROM 3 //gs issues



I've got a //gs motherboard, ROM 3, that seems to work fine...
mostly.  It runs all the Apple ][ software I've tried on it, and most
of the //gs software that I have.  It fails to run Dungeon Master and
SynthLab, but seems to run GS/OS and other GS software fine
(admittedly, I don't have a very extensive collection of GS software,
so my sample set has been fairly small so far).  When I run the //gs
diagnostic software on it, it passes everything but fails on the ROM/
CPU test - which gives virtually no info on what is actually failing.

I've swapped the CPU into a ROM 1 system, and it checks out fine.  The
motherboard doesn't have any obvious weak solder joints, or anything
that jumps out at me.

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?

Thanks.

--Nels