Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!microsoft!jimmat
From: jimmat@microsoft.UUCP (Jim MATHEWS)
Newsgroups: comp.windows.ms
Subject: Re: Help! HIMEM.SYS causes key presses to show up as DOUBLE
Keywords: himem, A20, 80286
Message-ID: <72788@microsoft.UUCP>
Date: 6 Jun 91 20:35:46 GMT
References: <1991Jun3.175636.7779@news.miami.edu> <30519@hydra.gatech.EDU>
Reply-To: jimmat@microsoft.UUCP (Jim MATHEWS)
Organization: Microsoft Corp., Redmond WA
Lines: 20

In article <1991Jun3.175636.7779@news.miami.edu> acidec@umbio.med.miami.edu (Artur Cideciyan) writes:
>I use a 80286/12 MHz with 1 Meg of memory...
>
>I load HIMEM.SYS only and nothing else, run Windows 3.0. It runs
>in standard mode with about 620K at start up. In any one of the
>Windows applications (e.g. Calculator) the keys pressed on the
>keyboard sometimes show up DOUBLE ... as if a character is sent to
>the window for both the press and the release of the key.

In Standard mode on a 286, Windows is frequently enabling and disabling
the A20 line.  On most AT compatible systems this requires sending
commands and data to the keyboard controller.  Some (usually older)
systems seem to get confused when a keypress and A20 command occur at the
same time--resulting in missing or duplicate keystrokes.  An updated 
BIOS and/or keyboard controller (if available) might resolve the 
problem.  Note that the vast majority of systems don't have this
problem.  Your mileage may vary...


Jim Mathews.   I speak only for myself, and I'm not even sure about that!