20 Jul
2004
20 Jul
'04
12:57 p.m.
I do have a spare M9202 from a random lot of 11/34 boards I
recently acquired, so I think I'm set.
Thanks to everyone who has provided their words of
experience on this. Once I get my RK11-D stuff
(it's on the way), I hope it will work without much
trouble.
-----Original Message-----
From: cctalk-bounces(a)classiccmp.org
[mailto:cctalk-bounces@classiccmp.org]On Behalf Of Ethan Dicks
Sent: Tuesday, July 20, 2004 6:02 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: RK05 interfacing to unibus PDP-11 (was RK05 stuff)
On Mon, Jul 19, 2004 at 11:50:10PM -0400, Ashley Carder wrote:
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?
Yes. That's what you should use (as opposed to the older M920s -
they changed the length of the cable to minimize bus reflection)
Also, I have not consulted the manuals to see how
close I might
get to overloading the CPU box. I have the following modules
in my box, starting from the right as you look inside the box
from the front:
First backplane:
11/34 CPU M8266 / 11/34 CPU M8265 / M9312 bootstrap / M7859 console
M7856 - DL11-W SLU+clock / G727A / M7891 - 64k memory / M7891 - 64k memory
M7762 - RL01 controller / M9202
Second backplane:
M9202 / G727A x 7 / M9302
That's pretty lightly loaded. It's always best to do the math,
especially if you want to add a heavy draw like a UDA-50 or a
DEUNA, but there should be no problem throwing an RK11-D in there,
based on what you already have.
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. I believe you can also put the RK11-D between the DD11-PK
and the DD11-DK.
Do you have a second M9202, or will you be leaving the DD11-DK
out of the loop for now?
-ethan
--
Ethan Dicks, A-130-S Current South Pole Weather at 20-Jul-2004 09:50 Z
South Pole Station
PSC 468 Box 400 Temp -100. F (-73.4 C) Windchill -135.7 F (-93.2
C)
APO AP 96598 Wind 6.7 kts Grid 155 Barometer 647.9 mb (11858.
ft)
Ethan.Dicks(a)amanda.spole.gov
http://penguincentral.com/penguincentral.html