19 Nov
2003
19 Nov
'03
5:55 p.m.
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(a)brouhaha.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)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.