On the Teletype model 33 and 35, one character delay was enough
for the carriage to return to the left margin. That made the CR
LF sequence the favored new line. (The LF could be executed in
one character time.) These machines used ASCII code as compared
with the model 28 and earlier models which used the Baudot code
we use for RTTY. I understand that these earlier machines had
the same timing, but I never had any direct experience with them.
Indeed, if you used the LF CR sequence, you needed to insert a
one character time delay for timing. A Rubout character was
often used for this delay.
73 Bill AE6JV
On 4/8/16 at 9:59 PM, k...@ptd.net (Bob) wrote:
Well as I understood it from years ago it was not just setup
but condition of the machine too. Today in logic terms it
would be a "race" condition. Would the carriage actually be
returned and ready in time? Quite often not so the solution
was to send multiple CR's or LF's. The mechanical equivalent
of one shots or logic delay loops. This was done before RTTY
and was a problem on TTY current loops.
-----------------------------------------------------------------------
Bill Frantz | Concurrency is hard. 12 out | Periwinkle
(408)356-8506 | 10 programmers get it wrong. | 16345
Englewood Ave
www.pwpconsult.com | - Jeff Frantz | Los Gatos,
CA 95032
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
