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Date: Sun, 15 Jan 2017 17:45:31 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Julian Elischer <julian@elischer.org>
Cc: Mark Johnston <markj@freebsd.org>, Bruce Evans <brde@optusnet.com.au>,
 svn-src-head@freebsd.org, rang@acm.org, svn-src-all@freebsd.org,
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Subject: Re: svn commit: r311952 - head/sys/ddb
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On Sun, Jan 15, 2017 at 01:07:58PM +0800, Julian Elischer wrote:

> 
> the old DEC machines had (from memory) ^O  which dropped all pending 
> output.
> Not so useful when there is 2MB of network buffers queued up to you, 
> but very useful on
> and asr-33 teletype.

Now it useful too, on serial console.
^O processing be present years ago in FreeBSD, but removed at time of
tty code rewrite. As I know patch for restore exist, nobody
review/commit.