PDP-11/44 Power Supply Questions

From: Zane H. Healy <healyzh_at_aracnet.com>
Date: Sat Apr 24 19:09:25 1999

>Uh-Oh. According to my printset, 26,28 is the -15V rail and 25,27 is the
>+15V rail. These voltages all look fine apart from that.
>
>>
>> However the following pins seem reversed
>> 23 GND SENSE
>> 24 +5 SENSE
>> I get nothing on the +5 SENSE, but I get +5.24V on the GND SENSE. What is
>> up with that?!?!?! I'm possitive that I'm not the one that is reversed as
>> I checked this several times.
>
>It appears you've looked at the connector backwards (I've checked the
>prints, and 23 is the 0V sense, 24 the +5V sense).
>
>I think the odd-numbered pins are towards the front of the machine, if
>that helps.
>
>-tony

Thanks! I think this answers my question. Since I used the "PDP-11/44
System Technical Manual" to do this, and went with the numbers based on
what I saw on 26,28 and 25,27 it looks like the manual is backwards on
those two, which meant I was backwards on 23 and 24.

I just powered it up with the CPU, cache, and 1Mb of RAM in place. Once I
figured out the correct console settings everything looks good. It passes
the console diagnostics! So now I'm plotting my next step.

                                Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh_at_aracnet.com (primary) | Linux Enthusiast |
| healyzh_at_holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
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Received on Sat Apr 24 1999 - 19:09:25 BST

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