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What is a \"BREAK\" [message #86041] Mon, 17 June 2013 17:37
Paul R. Grupp is currently offline  Paul R. Grupp
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Registered: June 2013
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Message-ID: <5889@brl-tgr.ARPA>
Date: Sun, 18-Nov-84 23:20:49 EST
Article-I.D.: brl-tgr.5889
Posted: Sun Nov 18 23:20:49 1984
Date-Received: Wed, 21-Nov-84 05:00:43 EST
Sender: news@brl-tgr.ARPA
Organization: Ballistic Research Lab
Lines: 15

WHAT?  MOST uarts alow for the generation of a BREAK condition to be sent
out the rs-232 line.  Given this most (all that I've seen) modems when
they see this condition it turn send it out the phone line...  The "problem"
seems to be that few BIOSes alow for a BREAK sent from the TTY to be sent
to the application program.  For that matter the BDOS calls to get TTY input
can't even pass along a NULL (NULL=0h and that is returned from the direct
consol i/o call if NO character is ready)!  But with some software mods
you CAN make your modem send a break.  One way to do this is to have the
application program do it's own i/o and pass along a break to the uart.
Another is to define some sequence of characters that when seen will in
turn signal the uart to send a break rather than sending the string i.e.
^_B (ctrl-underscore then "B") sends break, and to send a ^_ you would
type it twice.

-Paul
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