From: "A.Appleyard" <A DOT APPLEYARD AT fs2 DOT mt DOT umist DOT ac DOT uk>
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Date: Wed, 25 Oct 1995 16:51:35 GMT
Subject: That rings a bell!!

  Eli Zaretskii <eliz AT is DOT elta DOT co DOT il> wrote
(Subject: Re: Error, Emacs for DOS, Random upper case letters):-

> ... extraneous characters would appear in the buffer when a key was pressed
> during auto-save in the DOS port of Emacs (like if you press PageDown to
> scroll the buffer which shows a modified file). ... this is somehow
> connected to the way the terminal bell is rung on a DOS machine.  The
> problem never happens if you use visible bell; even under non-visible bell,
> it never happens until the bell is rung for the first time. ... The way the
> bell is rung in DOS version of Emacs is by writing the bell character
> ('\07') to the standard output with a call to write();

I never get this nuisance in my AAMACS which I wrote. In it when I want to
ring the bell I directly call the DOS interrupt "AX=0x0200; DX=7; int21;" =
"send character \007 to stdout (= the screen, there)", bypassing all of
djgpp's buffers and all of DOS's write-to-file buffers.