"party line" for terminals?

Richard legalize at xmission.com
Fri Mar 17 11:19:08 CST 2006


In article <4EE5D8CA323707439EF291AC9244BD9A0E5D56 at sbs.jdfogg.com>,
    "James Fogg" <James at jdfogg.com>  writes:

> There are some terminal protocols that use a daisy-chained RS232. The
> Burroughs/Unisys Poll Select protocol is one. It relies on the handshake
> lines in standard RS232.

This makes sense for this terminal; it apparently was used in an
airline system to display flight information (hence no keyboard port).
In this scenario I'd expect all the terminals to display the same
information so it makes sense that there might be a daisy-chain type
situation or a single set of wires that all the terminals listened to
('party line').

It seems that all kinds of special computing equipment was made for
airlines in the 60s, 70s and 80s.  How would one go about researching
technical specifics on this equipment?  Like those funky reservation
terminals with all the special keys.  Clearly these are not regular
terminals.
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