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Path: utzoo!watmath!clyde!burl!ulysses!allegra!alice!rabbit!sdh
From: sdh@rabbit.UUCP (Yah Right )
Newsgroups: net.micro.apple
Subject: Re: Dvorak Keyboard for Apple //e
Message-ID: <2804@rabbit.UUCP>
Date: Thu, 17-May-84 17:49:25 EDT
Article-I.D.: rabbit.2804
Posted: Thu May 17 17:49:25 1984
Date-Received: Fri, 18-May-84 07:04:18 EDT
References: <265@decwrl.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 33


There is a simple way to get your keyboard configured anyway you want.

All Apple II series machines handle character output in the following
way:

There is a routine in ROM called COUT (CHaracter OUTput). Upon entry to
this routine an ASCII value is expected in the A register (accumulator).
The routine does a jump to a routine pointed to by locations $36 and $37.

If one changes the bytes at these locations to go to a user routine,
it is simple to intercept the character to be printed and change it
to something else. A simple way to do this is with the following
program:

			TAX
			LDA TBL,X
			JMP $FDF0

That's it. The actual ASCII value is transferred to the X register and
then used as an index to pull the character that you want to see printed
in its place, then goes to a routine to print a character to the screen
($FDF0-called COUT1 I think).

An exchange can be done for all keys although problems crop up where
the shift key is concerned for Apple II and Apple II+ machines.

If there is sufficient interest, I will be more than happy to implement
the above program in a more user friendly environment.

"Sorry, Indy"
Steve Hawley
<allegra,alice>!rabbit!sdh