KL-10B in DEC-20 [was RE: Who's rewired their house for this hobby?]
RichA at LivingComputerMuseum.org
Wed Nov 26 13:57:49 CST 2014
From: Jon Elson
Sent: Wednesday, November 26, 2014 10:36 AM
> On 11/26/2014 01:47 AM, Eric Smith wrote:
>> On Tue, Nov 25, 2014 at 7:42 PM, Jon Elson <elson at pico-systems.com> wrote:
>>> On 11/25/2014 02:18 PM, Eric Smith wrote:
>>>> Actually to 13 massive linear regulators on multiple large heat sinks.
>>> There may have been several versions. The KL10B in a Decsystem 2020
>>> we had
>> A DECSYSTEM-2020 uses a KS10, which has no ECL, and uses a big
>> switching power supply made by third parties. The KL10B was used in
>> the DECsystem-1090, but not in any DECSYSTEM-20 models.
> Not true! The CPU was, absolutely, a KL10B. It was in a big orange
> cabinet that was fairly similar in size and shape to a VAX 11/780. It
> had a PDP 11/40 (I think) in the next bay over as the I/O processor.
> I am not so clear about the exact "DECSystem" designation, but it VERY
> much was a DECSystem 20<something>. [...] The label on the front of
> the cabinet said "DECSystem-20" without specifically giving the model
Only the DECSYSTEM-2020 (with the KS10 processor) expanded on the "20"
in the name.
I believe that the KL10B processor was used in the so-called "Model A"
DECSYSTEM-2040 and the DECsystem-1080. All the later systems, generically
called "Model B" by the diagnostics and RSX-20F, were the various suffixes
named by Eric, along with some he did not mention.
We have a non-running 1090 here at the museum which is clearly and
unambiguously labeled as a KL10D, as well as a KL10PV (blue 1095) and
KL10PW (orange 2065) which run WAITS and Tops-10 7.04, respectively.
Vintage Computing Sr. Systems Engineer
Living Computer Museum
2245 1st Avenue S
Seattle, WA 98134
mailto:RichA at LivingComputerMuseum.org
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