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From: jxf@altair.cis.ksu.edu (Jerry Frain)
Newsgroups: comp.sys.mac.programmer
Subject: Solution: swapping keys on extended keyboard
Message-ID: <1991Jan3.084459.24275@maverick.ksu.ksu.edu>
Date: 3 Jan 91 08:44:59 GMT
Sender: news@maverick.ksu.ksu.edu (The News Guru)
Organization: Kansas State University
Lines: 41


A while back I posted a request for help swapping the control key
and caps lock key on the Apple extended keyboard.

I didn't receive any replies on how to _logically_ swap the keys
(I did receive one very helpful reply on how to physically swap the
lock-down mechanism), so I thought I'd post the solution in case
anyone else is interested.

The only references I found were Apple Tech Note #160, and IM-V,
pages 190-193.  They proved to be quite adequate (once I found
them).

Basically, there is a KMAP resource in the System file which maps the
raw key codes to "virtual" key codes.  The fourth byte offset of the
KMAP resource ID #2 in the System file begins a 128-byte array of
virtual key codes (see tech note #160).  The raw key code is used as
an index to this array.

The eighth line of this resource (from ResEdit) looks like this:

        000038  3435 3B37 38B9 3A7B

Swap the fourth and sixth bytes so that the line looks like this:

        000038  3435 B937 383B 3A7B
                     ^^     ^^

These two bytes are the "virtual key codes" for the control key, and
caps lock key, respectively.

That's all there is to it.

  --Jerry

--
Jerry Frain -- Systems Programmer               Kansas State University
                                        Department of Computing & Info Sciences
Internet : jxf@cis.ksu.edu                         Manhattan, Kansas
UUCP     : ...!rutgers!ksuvax1!jxf