What is the KH11-A? (was Re: Differences between the PDP-11/15 and PDP-11/20)

Ethan Dicks ethan.dicks at gmail.com
Mon Aug 22 08:43:25 CDT 2016

On Mon, Aug 22, 2016 at 8:16 AM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
>     > From: Ethan Dicks
>     > Second, many/most of the CPU modules are -YA variants, and the "PDP-11
>     > Field Guide" mentions that they would be part of a KH11-A.
> I've been told that it's a revision to the CPU timings to reduce NPR latency,
> although I have no details; I had previously looked online, and was not able
> to locate anything about it.

Nor was I.

>     > a full set of boards for a KE11-A. I have been sniffing around for a
>     > KE11-B (single-board version), and now, I don't need to (as long as
>     > this one works or can be repaired).
> Doesn't it need a custom backplane too? Do you have that?

I have no idea, but if it does, I have the 3 BA-11 boxes this machine
came in, just not in the same room as the boards, so I don't have
backplane/system unit part numbers yet.

>     > my goal all along has been to fire up enough hardware for Warren
>     > Toomey's reconstruction of ~1972 UNIX


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