Thanks, Tim. In terms of documentation, CSS is kind of a black hole. I
don't know what happened to their archive, but it doesn't seem to have
ended up at CHM. The RB09 (used in unix v0) found its way into an early
PDP-9 Handbook, but that was a fluke.
Reindert Voorhorst found a DC01-EB exerciser listing. The XVM/MUMPS15
scanner code is mostly in a separately assembled module that is not
included with the listing we have.
Perhaps, like the KS11, we'll never know exactly how this gadget worked.
Without MUMPS15 sources, it's a moot point.
/Bob
On 5/25/2020 12:00 PM, simh-requ...@trailing-edge.com wrote:
Message: 3
Date: Mon, 25 May 2020 09:59:09 -0400
From: Timothe Litt<l...@ieee.org>
To:simh@trailing-edge.com
Subject: Re: [Simh] A lost 18b peripheral
Message-ID:<d89f161a-cd07-3486-4799-70d3f4d01...@ieee.org>
Content-Type: text/plain; charset="utf-8"
On 25-May-20 09:29, Bob Supnik wrote:
Looking through the XVM/MUMPS15 listing, I saw that the timesharing
terminals were attached via a DC01 communications multiplexer. There's
no reference to such a device anywhere in the 18b literature on
Bitsavers.
Because the PDP15 is a contemporary of the PDP8/I and the KI10, I
thought it might be a variant of their multiplexers, but I can't find
a match.
Another mystery.
/Bob
The DC01 was a CSS product. Option/module reveals that it was adapted
for the 8, 9, 15 & 11. You may find some hints in the other families,
though as you know, registers tend to have family ties...
* DC01-AA 8 line scanner full duplex tty &/or EIA \
* DC01-AB 8 TTY scanner half duplex \ 8 POS
* DC01-AC 8 Asyn scan full duplex EIA 3 cycle /
* DC01-AL Full duplex line unit for DC01-AA
* DC01-BB 8 TTY line scanner 1/2 duplex echo PDP-9
* DC01-EA 8 Line scanner full duplex (tty &/or
EIA) \
* DC01-EB 8 TTY line scanner half duplex echo +
logic \ 15
* DC01-EC 8 Line async scan full duplex EIA 3
cycle /
* DC01-ED 8 Line async scan, half duplex echo tty or EIA Sep. speeds /
* DC01-FA 8 line scanner full duplex (TTY &/OR EIA) \
* DC01-FD Improved DC01-FA \ 11
* DC01-FJ 32 line scanner, full duplex, can use any DF11 interface
Responsible engineers: B. Vachon, Bill Weiske, D. Hopkins, J. Larkin,
Reg Wetherall, J. Stefanowicz, Russ Moore
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