20 Jul
2004
20 Jul
'04
6:15 a.m.
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(a)classiccmp.org
[mailto:cctalk-bounces@classiccmp.org]On Behalf Of Tony Duell
Sent: Tuesday, July 20, 2004 12:35 AM
To: cctalk(a)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