Using the information provided here on the list, I have finally answered
this question to my own satisfaction.
Given that an M750 is a dual TTY MUX, I looked into communication equipment
for the 8/i and found the use of M750 modules. According to the Small
Computer Handbook (1970), the 680/i communications system is a PDP-8/i with
a DL8/i option. A DL8/i is capable of handling up to 128 terminal lines.
"Line servicing capability is implemented in a module two fashion using dual
Type M750 Serial Line Units."
I have no idea what "module two fashion" is (sounds like something from a
Paris runway). Nor indeed much of an idea what they are talking about.
Except that the DL8/i is a moby TTY MUX and the M750 is used in it.
Does anyone have a DL8/i (DC08A) that needs some more M750s :-)?
Thanks again for your help!
Vince
----- Original Message -----
From: "Eric Smith" <eric_at_brouhaha.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk_at_classiccmp.org>
Sent: Monday, November 17, 2003 5:19 PM
Subject: Re: DEC M750 flipchip?
> Ed wrote:
> > I have a later DEC logic handbook but it is not there....
> >
> > somewhere I have the master modules list... indeed the secret pile of
> > paper the DEC service folk had.... perhaps we need to ocr this when we
> > re-find it and put it online?
>
> Thanks to someone on the list who may not want to be named, I've scanned
> a photocopy of the 13-JUN-1991 Edited Option/Module Hardware List. A
> ZIP of a PDF file is available at:
> http://www.brouhaha.com/~eric/retrocomputing/dec/doc/oml/
> Be forewarned that the file is 165 megabytes. I'd actually much prefer
> to send out copies on CD-R for a nominal amount of money to cover media
> and postage, since bandwidth costs me money.
>
> I know various people out there have other editions of the OML. Earlier
> ones would be nice since they'd have more complete coverage of early
> machines. However, thus far no one else who has one has been willing
> to make it available to be scanned.
>
> > has anyone else done a ocr of this?
>
> I tried OCRing a few pages, and the results were not useful.
>
> According to the OML, the M750 is a Line I/O Control, equivalent to two
> W750s, and was used in the PDP-8 family.
>
>
Received on Thu Nov 20 2003 - 01:55:56 GMT