1 Sep
2013
1 Sep
'13
9:59 a.m.
From: robert.jarratt at ntlworld.com
To: cctalk at classiccmp.org
Subject: RE: Teletype Modem Options
Date: Sun, 1 Sep 2013 09:55:16 +0100
Be careful to determine what type of connection it is.Both RS232 and current loop
used the same 25 pin D connectors.Connecting the wrong two together can damage some
equipment.If the modem is a RS232, you'll most likely need a converterto run it with
the teletype.Dwight
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-
bounces at classiccmp.org] On Behalf Of John Ball
Sent: 01 September 2013 09:27
To: cctalk at classiccmp.org
Subject: Teletype Modem Options
When I received my model 33 it came with a UCC82 Call Control Unit as an
extra in the deal.
http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/t
eletype
/CGS_0127.jpg (Photo of the CCU)
Your Model 33 looks very clean, nice! You seem to have a perfect cover, mine
has a crack near the paper tape punch.
It doesn't seem to do much on its own (makes
the teletype print null
characters uncontrollably when you plug the system in)
The uncontrollable null printing happens when the current loop interface is
being used and there is no current. I assume it does this when you turn the
front switch to "Online", and that it does not do this when you switch it to
"Offline".
and I can't find any
information on what it did however just looking
at it and a small note
from
google says it was used for putting a phone line
on and off the hook and
dialing. The row of buttons at the bottom controlled a Bell 101 or 103
DataPhone which you hid away in the stand.
I've been searching up info on the 101 and I can't find a whole lot of
anything
short of it was one of the first modems, it was
110 baud and it had a
D-sub 25
port that you connected it a computer/terminal
with. They also seem to be
about impossible to find. I have modems that cat run at 110 baud however
god knows if the D-sub serial port on the back of them are the same and
even if they were I have no idea how it would of connected to the
teletype.
Does anybody have more information?
I don't know anything about the CCUs with internal modems though, mine just
has a current loop interface for connecting to a computer.
I strongly recommend you join the Greenkeys mailing list, the experts are
all there, and very very helpful too.
Regards
Rob