Plessey's My First PDP-11

From: 9000 VAX <vax9000_at_gmail.com>
Date: Fri Feb 18 12:57:02 2005

On Fri, 18 Feb 2005 10:20:30 +0100, Tore S Bekkedal <toresbe_at_ifi.uio.no> wrote:
> Yay, I have a PDP-11!! Yay! Yay!!
>
> It's a PDP-11/03, it's got a CPU, and RAM, and some interface cards.
>
> The backplane is a Plessey PM-F11/QU, shaped like this:
>
> F E D C B A
> ___________________________________
> 1 |_____|_____|_____|_____|_____|_____|
> 2 |_____|_____|_____|_____|_____|_____|
> 3 |_____|_____|_____|_____|_____|_____|
> 4 |_____|_____|_____|_____|_____|_____|
> 5 |_____|_____|_____|_____|_____|_____|
> 6 |_____|_____|_____|_____|_____|_____|
> 7 |_____|_____|_____|_____|_____|_____|
> 8 | power |_____|_____|_____|_____|
> 9 | regulator |_____|_____|_____|_____|
>
> I have connected an AT PSU to +5v and GND, though there is a +15v in. Is
> this used for anything?

I don't have a PDP11 but I have a VAX3900 which is QBUS based. From my
knowledge the power supply should supply a bunch of signals. For
example, DCOK, POK and INIT among others. There are +12v and -12v too.
Yours might be a UNIBUS machine. But you can not just get a +5V and
GND and expect it to work.

vax, 9000

>
> I have tried plugging in a QBUS debugger I got on ABCD6, I have tried
> plugging in the CPU (in AB9) with the debugger. Nothing. I can't get
> anything to live.
>
> Where should I plug things?
>
> Does anything use the +15v?
>
> Any other voltages I need?
>
> Thanks for the help!
>
> --
> Tore S Bekkedal <toresbe_at_ifi.uio.no>
>
>
Received on Fri Feb 18 2005 - 12:57:02 GMT