Yup, but not a hex extender. :-) I'd suggest Douglas Electronics - that's where
I bought my quad extender some time back.
There's also an interesting Unibus analyzer made by Guy Sotomayor, a major collector
(and a good guy). You can find out more about that at
. I'm not associated
with his business and I don't own the board, but Guy showed me one when I met him to
buy a machine and it sounds pretty cool. -- Ian
-----Original Message-----
From: cctalk-bounces at
classiccmp.org [mailto:cctalk-
bounces at
classiccmp.org] On Behalf Of Josh Dersch
Sent: Monday, April 13, 2009 12:26 PM
To: On-Topic and Off-Topic Posts
Subject: Re: Help w/DEC H742 +15V...
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?)
> -tony
>
>
>