[vcf-midatlantic] Mac IIci, dead (PICS!)

Ethan O'Toole 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."

 		- Ethan

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