[vcf-midatlantic] Mac IIci, dead (PICS!)
telmnstr at 757.org
Fri May 14 13:13:29 UTC 2021
> Does it handle Sync on Green? I found out the hard way that the IIci's
> built-in video is SoG ONLY, which was a big surprise to me.
> Fortunately, I had one LCD that handled SoG, but it's fairly uncommon
> these days. The wire-only adaptors (even the excellent Griffin MacPnP)
> don't convert SoG because it generally requires active conversion and
> thus has to be powered.
Hmmm not sure. But I didn't know that the IIci internal only did that. I
can ask a friend to bring over something compatible.
I used to do a lot with SGI and Sun systems/monitors and a lot of them
were funky fixed resolutions at different frequencies and often SoG. It
was pretty maddening honestly.
Thanks for the heads up on that. I wouldn't be surprised if my 15" Hansol
brand LCD can do SoG, it's an oddball and I've thrown 24khz "EGA" arcade
video into it and other stuff and it usually works.
I *think* the machine isn't thinking because all the data pins on the
PROMs are dead on power on. I just see no activity. I got schematics and
found the reset circuit loops through the audio chips or something. I see
that signal is high until I hit the reset button then it does go low.
Was looking for a power on reset circuit that might not be letting the CPU
run? That is my "next check."
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