RK05 interfacing to unibus PDP-11 (was RK05 stuff)

From: Ashley Carder <wacarder_at_usit.net>
Date: Tue Jul 20 06:15:57 2004

M7819 and M7814 are multiplexers, for EIA and 20mA devices,
respectively. I'm running RSTS/E and plan to connect various
terminals and devices to the system.

-----Original Message-----
From: cctalk-bounces_at_classiccmp.org
[mailto:cctalk-bounces_at_classiccmp.org]On Behalf Of Tony Duell
Sent: Tuesday, July 20, 2004 12:35 AM
To: cctalk_at_classiccmp.org
Subject: Re: RK05 interfacing to unibus PDP-11 (was RK05 stuff)


>
> I looked in my 11/34 CPU box. There's room for a 4-slot backplane.
> I currently have two 9-slot backplanes. Can I use an M9202 to
> connect the 9-slot backplane to the RK11-D 4-slot backplane?


I don;'t see why not. The M9202 has 2' of Unibus cable folded up inside
to give a little delay. Otherwise it's the same as the M920. I think you
can use either.

>
> Also, I have not consulted the manuals to see how close I might
> get to overloading the CPU box. I have the following modules

I don't think that's a problem. There are 2 5V regulators in the CPU box.
IIRC, one supplies the CPU backplane, the other the expansion area (9
slot and 4 slot in your case). Your 9 slot backplane is pretty empty, it
should easily be able to supply the RK11-D

> in my box, starting from the right as you look inside the box
> from the front:
>
> First backplane:
> 1) 11/34 CPU M8266
> 2) 11/34 CPU M8265)
> 3) M9312 bootstrap
> 3) M7859 console
> 4) M7856 - DL11-W SLU+clock
> 5) G727A
> 6) M7891 - 64k memory
> 7) M7891 - 64k memory
> 8) M7762 - RL01 controller
> 9) M9202
>
> Second backplane:
> 1) M9202
> 2) G727A
> 3) G727A - Plan to put M7819 and M7814 in two of these slots

Remind me as to what those are, please.

> 4) G727A
> 5) G727A
> 6) G7273
> 7) G727A
> 8) G727A
> 9) M9302
>
> If I add the RK11-D backplane to the left of the other two,
> then can I use another M9202 to connect the two backplanes
> and move the M9302 to slot 4 of the RK11-D backplane?

Yes,that's exactly what you have to do. You also need to connect the
power cable from the RK11-D (which may well end in a little single-height
PCB that plugs into one of the RK11-D slots) into the 15 pin and 6 pin
sockets on the power distribution PCB at the bottom rear of the CPU box.

>
> RK11-D backplane:
> 1)
> 2)
> 3)
> 4)

I can't remember the order of the cards here, but I can look it up in the
prints if you get one and don't know where the cards go.

-tony
Received on Tue Jul 20 2004 - 06:15:57 BST