NetNews Usenet Archive 1992 #26/NN_1992_26.iso/spool/vmsnet/pdp11/811

Internet Message Format | 1992-11-05 | 1.7 KB

Path: sparky!uunet!usc!cs.utexas.edu!rutgers!spcvxb!terry
From: [e-mail] (Terry Kennedy, Operations Mgr.)
Newsgroups: vmsnet.pdp-11
Subject: Re: Plessey memory
Message-ID: <[e-mail]>
Date: 5 Nov 92 06:08:33 GMT
References: <[e-mail]>
Organization: St. Peter's College, US
Lines: 26

In article <[e-mail]>, [e-mail] (Johnny Billquist) writes:
> Hi, I have a question about some memory I have for the 11/70.
> I have four memory boards, which was plugged into an 11/70, but
> someone has taken the memory boards out. The person who have the
> 11/70 said that the boards are 1Mb each, for a total of 4Mb.
> It is Plessey P/N 705075 Rev.A
> There is also four small homemade boards that goes with this, which
> the guy claimed was neccesary to get the memory working on the 11/70.
> Does anybody here have any clues they could give me?

  Hmmm. I'll try to overcome my disgust at the name Plessey - I once managed
an 11/34 that had _only_ the 11/34 CPU boards from DEC - everything else was
incompatible junk from Plessey - non-emulating disks, tapes, etc.

  Anyway... I assume you mean that the memory boards go into the CPU back-
plane, rather than in an external memory box? In that case, I'd assume that
the four small boards are bringing the necessary signals (probably out of
the slots where the cache/memory interface boards used to be) to wherever
the memory installs.

  This sounds pretty far-fetched, though. The only company I know of that's
done anything like this is Setasi/DDS.

    Terry Kennedy        Operations Manager, Academic Computing
    [e-mail]    St. Peter's College, Jersey City, NJ USA
    [e-mail]    [phone]