[Simh] A lost 18b peripheral

[Bob Supnik]

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-request at trailing-edge.com wrote:
> Message: 3
> Date: Mon, 25 May 2020 09:59:09 -0400
> From: Timothe Litt<litt at ieee.org>
> To:simh at trailing-edge.com
> Subject: Re: [Simh] A lost 18b peripheral
> Message-ID:<d89f161a-cd07-3486-4799-70d3f4d01dee at 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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