DEC Rainbow PC100-A

Warner Losh imp at
Sun Jan 17 19:11:39 CST 2016

Would love to help, but I have the PC100-B. The PC100-A board is somewhat
different than the
PC100-B, but not super different.

Have you checked the diagnostics table in the technical reference to see
what all LEDs lit means?
I'd crack open my copy, but it is buried in boxes at the moment.


On Sat, Jan 16, 2016 at 2:15 PM, shadoooo <shadoooo at> wrote:

> Hello,
> I recently took a DEC Rainbow PC100-A.
> It has been a huge house for a lot of spiders, who deposited eggs and dead
> insects all around.
> After full disassembling, cleaning and reassembling, I'm ready to try it!
> PSU seems to work well, power goes on with almost precise voltages, then
> all the test leds on the back will lit on...
> then nothing happens! No video, no sign of life.
> Clearly there's a problem at the very beginning of the boot phase, that
> could be caused by a lot of reasons.
> In the next days I will try to analyze possible causes of the problem with
> oscilloscope,
> in the meantime I'm searching a schematic, as board is very complex to
> follow trace-by-trace.
> On bitsavers I found a schematic of PC100B, but the main board is not the
> same as PC100A.
> Anybody has a schematic for PC100A?
> I suspect that ROMs could be damaged, anybody has a correct dump to verify
> the content of the EPROMS?
> Thanks
> Andrea

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