9 May
2017
9 May
'17
3:39 p.m.
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