(I'm ba-ack...) Problems with DW11-B...

From: Daniel A. Seagraves <DSEAGRAV_at_toad.xkl.com>
Date: Sun Aug 15 15:47:16 1999

Okay, situation as follows. I finally cleared some time to play with my
toys again... The idea is, I have an 11/83, an RL02, and plenty of RAM.
It runs 2.9BSD at the moment. I also have a DZ11 clone by Aziv (or something
like that) in there, it works too. I got my hands on a RSTS 8 RL02 SAVRES
tape (Found it in my scratch magtape pile! Can't believe I didn't see this
before!) and wanna play with RSTS instead of 2.9BSD. So, the idea was, I
have a tape drive and UNIBUS TS-type controller that both work, and a BA11-K.
(It was the one on the 11/44, which, sadly, has died of mysterious marginality.
It catches random bus errors and starts only about 1/4 of the time. Don't
worry, I didn't pitch it - I plan on debugging it later.) Anyway, I wanted
to hang the DW11-B between the 2 boxes (The 83 and the BA11), then use the
TS tape and drive to back up BSD to a tape, and then try restoring this
RSTS tape. If the RSTS tape dies then, all I have to do is get a minimal UNIX
back on the RL02 and restore my tape. Too bad UNIX doesn't make self-booting
backup tapes like VMS does... (Speaking of which, did any other OS do this?)

Anyway, the problem is, when the DW11-B is installed in the 83,. the memory
check diagnostic fails at address 0, and the MAP option on the crash screen
only sees the addresses on the CPU card (So the DW11 is clobbering the bus.)
Questions are:

1. Has anyone done this before?
2. Are DW11-Bs incompatible with Q22 backplanes?
3. Is there some obvious screw I'm missing?

I'm using the quad-height end in the Qbus end, and the dual-height end in the
UNIBUS end. I assume if I had them backwards, I'd get smoke... Also, the
fuse in the dual-height end is good, I checked it.

Help would be much appreciated!
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Received on Sun Aug 15 1999 - 15:47:16 BST