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From: Lynn Wheeler <lynn@garlic.com>
Newsgroups: alt.folklore.computers
Subject: Re: Origin Of The Autobaud Technique
Date: Fri, 15 Nov 2024 21:52:20 -1000
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Lawrence D'Oliveiro <ldo@nz.invalid> writes:
> Instead, the docs said you just had to press RETURN once or twice, and the 
> terminal driver would automatically detect the right line speed and pop up 
> a nice, legible login prompt. In practice, I don’t recall ever having to 
> press RETURN more than once. It just seemed like magic. (We had fewer TV 
> channels in those days...)

... mentioned it in post to
  Any interesting PDP/TECO photos out there?

thread a few hrs ago ... in the late 60s, did it for clone ibm 360
telecommunication controller we built using Interdata/3 machine
(upgraded to Interdata/4 with cluster of Interdata/3s) ... that
Interdata and then Perkin/Elmer sold.
https://en.wikipedia.org/wiki/Interdata
https://en.wikipedia.org/wiki/Perkin-Elmer#Computer_Systems_Division

initial (virtual machine) CP/67 delivered to univ had 1050&2741 terminal
type support with automagic terminal type recognition. Univ. had ascii
TTY (mostly 33, but some 35), so I added ascii terminal support
integrated with automagic terminal type recognition (able to use the SAD
CCW to switch the terminal type line scanner for each line/port). I then
wanted a single dial-in number ("hunt group") for all terminal types
... but while the terminal type line scanner could be switched for each
port, IBM had hard-wired the port line speed ... thus kicked-off the
univ project to build our own clone controller that also did "autobaud".

-- 
virtualization experience starting Jan1968, online at home since Mar1970