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From: mark@cbosgd.UUCP (Mark Horton)
Newsgroups: net.dcom
Subject: Re: Xon/Xoff and editors
Message-ID: <572@cbosgd.UUCP>
Date: Thu, 10-Nov-83 10:44:44 EST
Article-I.D.: cbosgd.572
Posted: Thu Nov 10 10:44:44 1983
Date-Received: Fri, 11-Nov-83 06:29:44 EST
References: <1380@rlgvax.UUCP>
Organization: AT&T Bell Laboratories, Columbus
Lines: 16

Actually, EMACS uses raw mode for two reasons.  One is that xon and xoff
are commands (search and quote).  The other is that some terminals have
meta keys and can send 8 bit characters.

I understand that CCA EMACS runs in cbreak mode, sets the xon/xoff characters
to two unused control chars (^^ and null or some such things), and
runs with xon/xoff flow control.  Of course, this works best on terminals
like the Ambassador that allow you to ste the xon/xoff chars as well.

vi runs in cbreak mode - it has since 1978.  It's a little known fact that
a very old version of vi (ex version 1.1 in visual mode) used ^S as a
"print the name of the file and my position in it" command and ^Q as a
quote (like EMACS) command.  Since it ran in raw mode, xon/xoff was not
an option.  When V7 came out, the ^S command was moved to ^G, and ^Q
was moved to ^V.  A year later, nobody remembered that ^G and ^V used
to be on other keys.  However, EMACS stands by its ^S and ^Q commands.