From: bqt@update.uu.se (Johnny Billquist)
Subject: [pups] pdp11/73 memory
Date: Sat, 13 Dec 2003 02:56:25 +0100 (CET) [thread overview]
Message-ID: <Pine.LNX.4.21.0312130254520.7015-100000@Tempo.Update.UU.SE> (raw)
In-Reply-To: <20031212172335.GB3476@bcr10.uwaterloo.ca>
On Fri, 12 Dec 2003, David Evans wrote:
> On Fri, Dec 12, 2003 at 06:31:12PM +0200, Christos Papachristou wrote:
> >
> > Is it possible to keep some
> > of the MicroVAX memory modules if they are below or equal to 4 megs?
>
> No. The uVAX memory requires special PMI stuff (carried over those
> ribbon cables) that the PDP-11 CPUs don't grok. At least, that's
> what I've always been told.
And that's correct.
The 11/73 require Q-bus memory. The only VAX that used this is the
MicroVAX I.
If the 11/73 really is a disguised 11/83 CPU, you can use the 11/83 PMI
memory, which don't work the same way as the VAX PMI.
(PMI by the way stands for Private Memory Interconnect)
Johnny
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at update.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
next prev parent reply other threads:[~2003-12-13 1:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-12 16:31 Christos Papachristou
2003-12-12 17:23 ` David Evans
2003-12-13 1:56 ` Johnny Billquist [this message]
2003-12-12 17:56 Fred N. van Kempen
2003-12-12 19:29 ` emanuel stiebler
2003-12-12 20:14 ` David Evans
2003-12-13 1:58 ` Johnny Billquist
2003-12-12 22:49 Carl Lowenstein
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