Help w/DEC H742 +15V...
derschjo at mail.msu.edu
Mon Apr 13 14:26:10 CDT 2009
Tony Duell wrote:
>> ACLO & DCLO are active-low signals at the time when I was testing out
>> the supply...) Guess I get to pull the supply again and do some more
>> debugging :). Is there a quick 'n dirty way to fake out/bypass these
>> signals so I can at least see if the CPU runs at all?
> If you disconnect the wries between the PSU and the backplane (just
> remove the pins from one of the mate-n-lock connectors, but rememerb
> where they go!), the signals will be pulled high by the Unibus
> terminator. I don't know if everything will initialise properly in that
> case (I think it should do), but at least the CPU will do soemthing.
Thanks -- just tried this, and I still get the same behavior from the
CPU. ACLO and DCLO are now pulled high. Well, this is going to be a
fun project :). Guess I need to start debugging the CPU, any
suggestions on where to start? (Anyone have a Unibus extender card?)
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