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

Paul Koning paulkoning at comcast.net
Mon Aug 22 09:40:17 CDT 2016

> On Aug 21, 2016, at 11:36 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
> ...
> 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.  About the
> only description I can find for what that is, is a single mention (in
> PDP-11_PeripheralsHbk_1973.pdf) of the "large-system capability
> option" related to the DT03-F Unibus switch requirements.  Anyone know
> what this is?  I'm reasonably certain it doesn't matter for my needs,
> but I'm curious.

The April 1983 Option/Module list (one of several at Bitsavers) says that a KH11-A is "system expansion (latency reduction)".  Not clear what that means.  It says that it is used with KA11, KC11.


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