26 Nov
2014
26 Nov
'14
11:57 a.m.
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
number.
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.
Rich
Rich Alderson
Vintage Computing Sr. Systems Engineer
Living Computer Museum
2245 1st Avenue S
Seattle, WA 98134
mailto:RichA at LivingComputerMuseum.org
http://www.LivingComputerMuseum.org/