110 Baud modem

[Pete Lancashire]

The relays are for controlling the modes function/mode. For example if the
unit is put in local mode, or when an incoming call is "Answered" the motor
will start running.



On Tue, May 9, 2017 at 8:22 AM, Anders Nelson via cctalk <
cctalk at classiccmp.org> wrote:

> Good lord, is that a pile of relays to click out bits rotary-style?
>
> =o
>
> --
> Anders Nelson
>
> +1 (517) 775-6129
>
> www.erogear.com
>
> On Tue, May 9, 2017 at 7:39 AM, Paul Koning via cctalk <
> cctalk at classiccmp.org> wrote:
>
> > So Wikipedia is wrong, since it claims that it was introduced in 1958 for
> > ASCII and 110 Baud.
> >
> > Then again, 101/103 modem modulation doesn't care about speed (it isn't
> > clocked) up to a limit of 300 baud or so.
> >
> > I wonder if there is also terminology here: what we now call a "modem"
> was
> > earlier called a "tuning unit" and that term goes back to 5 bit machines
> > and the 1950s.  It may be more a radio TTY term than a landline term, but
> > the concept is identical.  I remember QST articles around 1958 or so
> about
> > RTTY tuning units, built out of tubes with a relay (differential relay?)
> > thrown in for good measure.
> >
> >         paul
> >
> > > On May 9, 2017, at 10:32 AM, Pete Lancashire <pete at petelancashire.com>
> > wrote:
> > >
> > > The C version came later with the introduction of ASCII ( 5 to 8 bits )
> > and 110 baud. So it does not go back to the 50's.
> > >
> > > I do not know when the C version was released. The ASCII Teletype Model
> > 35 was introduced in 1961.
> > >
> > > -pete
> > >
> > >
> > >
> > >
> > > On Tue, May 9, 2017 at 6:47 AM, Paul Koning <paulkoning at comcast.net>
> > wrote:
> > >
> > > > On May 8, 2017, at 10:27 PM, Pete Lancashire via cctalk <
> > cctalk at classiccmp.org> wrote:
> > > >
> > > > Bell 101C
> > > >
> > > > https://goo.gl/photos/hrhAwvzMBLWWteXu6
> > > >
> > > > https://en.wikipedia.org/wiki/Bell_101
> > >
> > > Interesting.  Released in 1958 but that unit is stamped 10 years later.
> > >
> > > It would be nice to see photos of the circuit boards.  And I sure
> wonder
> > what those rows of large relays are for.
> > >
> > >         paul
> > >
> > >
> > >
> > >
> >
> >
>
>