PDP-11/44 CPU Configuration

From: Christian Fandt <cfandt_at_netsync.net>
Date: Wed Apr 21 19:42:12 1999

Upon the date 09:26 PM 4/21/99 +0100, Tony Duell said something like:
>> That's where I'm at with my 11/34A, a slow-moving project. Seems when I put
>> the project aside a couple of weeks before Megan started work on hers, the
>
>You're in good company. It took me over a month from getting my first
>11/45 to turning the key for the first time. And I didn't have anything
>else to do. I was reading printsets, figuring out what everything did,
>etc. Took me another month after that to have it run a program...
>
>> bus was hanging for some reason. I've got to find and check the bus grant
>
>Open grants are the most likely cause of this.
>
>To start with, just use the CPU backplane (you can get the CPU, one
>memory board and a DL11-W in it, which is all you need to start with) and

Yep, that's what I'm thinking of . . .

>keep the M9302 terminator out as well (you can put in an M930 if you have

Hmmm, haven't left out the M9302 as I thought it *must* be in, even in
minimal config as pointed out above, for proper termination no matter what.

I have no M930 or M9300.

>one). If it works now, but hangs with the M9302 in the last slot, then
>it's almost certainly a grant problem.
>
>> Briefly, which are the NPG jumper pin numbers again?
>
>CA1-CB1 on an SPC slot.

Got it.

Thanks so far . . .

You just might get me to steal some time from what I really *must* be doing
to get the old house cleared out to sell and use it to fiddle with the 34A
;) Maybe this weekend. Friday is supposed to be rainy and crappy outside
so maybe then. An appropriate Bavarian expression is what I want to use
here but have no idea of the spelling as Bayerische is not a written
language :) (Es ist Schou mul-moi Hans??)

Regards, Chris
-- --
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt_at_netsync.net
Member of Antique Wireless Association
        URL: http://www.ggw.org/awa
Received on Wed Apr 21 1999 - 19:42:12 BST

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