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Date: Tue, 15 Nov 2005 23:21:30 -0500
From: David Scheidt <dscheidt@panix.com>
To: David Wolfskill <david@bunrab.catwhisker.org>, stable@freebsd.org
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Subject: Re: Swapfile problem in 6?
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On Tue, Nov 15, 2005 at 07:18:35PM -0800, David Wolfskill wrote:
> On Tue, Nov 15, 2005 at 06:09:33PM -0800, Rob wrote:
> > ...
> 
> > 
> > What is this "serial BREAK"?
> > How do I "send a serial BREAK" at the serial
> > console? Is this some magic key combination?
> 
> I'm probably saying something about my age by doing this....  :-}
> 
> A "BREAK" (in serial communications) is an absence of start or stop
> bits for more than a character's worth of bits, is handled as a
> "framing error," and is distinct from any character.
> 
> Now, to generate one, you would normally hit the BREAK key of your
> terminal (Control-BREAK on some; I think Hazeltine had this feature of
> dubious merit).
> 
> If you are using a serial communications program (such as "tip") instead
> of an ASCII terminal, it depends on the program you're using.
> 
> In the case of tip, the sequence "~#" at the beginning of a line will
> generate tip's best approximation of a framing error.
> 
> In the case of kermit, Control-\B does it.

If you're using a terminal program on something like Windows or a
Macintosh, there's usually a menu option to send a BREAK.