KM11 Clone

From: Gooijen H <>
Date: Tue Dec 14 01:43:15 2004

> It's the RK11-C... there's a single slot facing the front of the rack
> that I expect is where it goes. The RK11-D is a quad backplane
> thingie that goes inside a BA-11 or some such (and the RKV11-D is a
> version of it that fits in an external 4-slot enclosure with a set of
> cables and a paddle card that go to a host's Qbus.
> I'd be interested to know what _other_ peripherals have a KM11 slot.
> I personally want one to debug my RK11C (even though I am usually
> using my RK05s with the aforementioned RKV11-D) just for the sake of
> doing it. I do _have_ at least one RK11D that I could use for "real
> work", but I'd like to get the -C working nonetheless.
> -ethan

I read that the 11/40 CPU has 2 positions in its backplane for KM11's.
In slot 1 (the first), position F the KM11 is used as a monitor for
the KD11-A CPU and it allows to microstep the CPU instructions. When
the KM11 is installed in slot 1, position E, the KM11 monitors KT11-D
(the MMU), KE11-E (EIS optin) and KE11-F (FIS option).
So, to go the full stretch you'd need 2 boards to watch everything in
a PDP-11/35 (or /40), but I wonder if you'll ever need/do that ...
except to see it once in actual operation :-)

Note that DIGITAL writes that in normal operation the KM11 is *not*
part of the system.

- Henk, PA8PDP.
Received on Tue Dec 14 2004 - 01:43:15 GMT

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