Teletype services

Brent Hilpert hilpert at
Thu Nov 5 18:03:01 CST 2015

On 2015-Nov-05, at 10:59 AM, John Ball wrote:
> I've been trying for the past week to verify that telephony on my teletype
> machine (model 33) is functioning properly but the biggest hurdle I am
> running into is I have nothing to easily dial into. Everyone I know off hand
> either don't have a modem anymore or theirs is a Winmodem which won't work.
> There's only one phone line into the residence here and those bluetooth to
> cellular POTS bridges are too lossy to make do and connect to a machine
> here. There is that youtube video of the model 37 apparently connecting to a
> system at the Living Computer Museum in 2013 (MikoF6KZjm0) where they dialed
> into a BBS I've never seen listed anywhere but the number listed no longer
> seems to work and in the description it states the service is no longer
> available. What other public systems are still out there that will work this
> speed or possibly better yet, is there anyone out there willing to try a
> teletype-to-teletype conversation?

Curious as to the setup you are attempting this with, i.e. exactly what modem are you using?
One in the base of the 33 or some common external one?

I'm not familiar with all the possible modem variations one might find in a 33, but AIUI the modem for the 33 at the standard 110 bps was Bell 101 standard.

There's not going to be a lot to talk to out there using the old parameters.
Even if someone had an auto-baud dial-in setup out there somewhere, I wouldn't anticipate it being compatible.

We have a 101-standard modem (in the base of a 33) around here, but have never tried it or tried connecting it to a phone line, I'm also not familiar with it enough to know how originate/answer issues are dealt with (whether it can do both) for such 33 to 33 communication.

More information about the cctech mailing list