PDP-8/E H724 power supply and serial interface

Vincent Slyngstad vrs at msn.com
Thu Nov 20 09:42:42 CST 2008

From: "Pete Turnbull" Wednesday, November 19, 2008 4:54 PM
> I've decided to be extra careful, and re-form the main electrolytics. 
> So far the ones I've done look fine, but it'll be a while before I get 
> them all done, as I have to do one at a time (more or less), and isolate 
> each from the circuit.  The terminals are easy to get at but the wiring 
> is tightly packed and I can't see the values so I'm not entirely sure 
> which ones are which.  It would help to have a component layout drawing, 
> which I imagine would be part of the engineering drawings set.  However, 
> all I can find online are the schematics and layouts for the two little 
> control boards.  Does anyone have the rest of the drawings?

From: alt.sys.pdp8 October 15, 2007
>On Oct 7, 4:32 pm, "Gordon S. Hlavenka" <nos... at crashelex.com> wrote:
>> Well then, try this:http://www.crashelex.com/pdp8e-IPB.PDF
>> (BTW I encourage anybody else who's archiving docs to snag this one
>> since I can't promise how long it'll stay on my server :-)
>> --
>> Gordon S. Hlavenka          http://www.crashelectronics.com
>>                It's bad luck to be superstitious
>Saved me hours of tracing wires. Found 3 blown pass transistors
>(2N3055) in the +5V supply. Thankfully one can still purchase these
>from Digikey.
>Hope to get the power supply fixed this weekend so I can start
>testing boards.
>Roger Wink

The information you seek is on scan pages 10 and 14 of 35, and the PDF 
is still available at crashlex.com.  (I actually found it in my local 
copy, then went to see if it was still out there.)


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