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From: page@ulowell.cs.ulowell.edu (Bob Page)
Newsgroups: comp.sys.amiga
Subject: Re: A1000 & A2000 keyboard
Message-ID: <1241@ulowell.cs.ulowell.edu>
Date: Thu, 30-Apr-87 13:29:07 EDT
Article-I.D.: ulowell.1241
Posted: Thu Apr 30 13:29:07 1987
Date-Received: Sat, 2-May-87 11:02:14 EDT
References: <18700002@silver> <559@neoucom.UUCP>
Reply-To: page@ulowell.cs.ulowell.edu (Bob Page)
Organization: University of Lowell
Lines: 29

wtm@neoucom.UUCP (Bill Mayhew) wrote in article <559@neoucom.UUCP>:
>The ROM kernel manual discusses ghosting.  You'd have to hit pretty weird
>combinations of keys-- something like d-f-j-k all simultaneously to
>cause a ghost character.

Well, you should have read the RKM, and you would have known what you
were talking about.  You DON'T have to hit strange combinations of keys -
and d-f-j-k would not trigger the bug.

The bug (often called the "from" or "frlom" bug) occurs when you
type and hold three keys that form three corners of a parallelogram.
If you type two keys in any "column" (a column is like 2wsx or 7ujm)
AND type a key in the same "row" as one of the keys that is already
pressed, the fourth "ghost" key will appear -- the fourth corner in the
parallelogram.  I'd draw a picture, but you can just look at your
keyboard.

To illustrate: type F, R and O.  The fourth 'corner' is L, and that
gets sent by the keyboard scanner, along with the O that you pressed.

> I've never seen it on my machine at home, which dates from October 1985.

Some typists will not see it because they don't have 'heavy' fingers
that stay on the keys long enough, or because they type correctly
and use the same finger for F and R.  I see it all the time.

..Bob
-- 
Bob Page, U of Lowell CS Dept.   page@ulowell.{uucp,edu,csnet}