Plessey's My First PDP-11

[9000 VAX]

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>
> 
>