Modem Collection

From: Frank McConnell <fmc_at_reanimators.org>
Date: Fri Jul 11 16:41:58 1997

Marvin <marvin_at_rain.org> writes:
> Just curious (again!) if anyone is collecting the early modems used on
> computers and what might have been the earliest commercial phone modem.

I have a few, but not what I would call "early". An old Omnitec 701A
(s/n 3) acoustic coupler that I used to use with a Teletype ca. 1978
(still worked when I tried it about a year ago, too). Also some S-100
modems, including a couple each of PMMI MM-103 and Hayes Micromodem
100, and what I am guessing is an earlier (1978) effort by D. C. Hayes
called the 80-103A.

> I have several devices that are called modem eliminators and I believe
> these are basically serial cable boosters to increase the permissible
> cable length.

It depends. They may also provide clock signals for synchronous DTEs
(as would ordinarily be done by the modems).

-Frank McConnell
Received on Fri Jul 11 1997 - 16:41:58 BST