8042 woes

From: ziliath (ziliath_at_myway.com)
Date: 04/23/04 

Date: Thu, 22 Apr 2004 22:25:39 +0000 (UTC)

Hi all,

I'm writing a little 8042 keyboard driver, and although I'm
finally having some luck I have to say that the publicly
available information (on the Web) is really insufficient.
The behavior of this controller is not as easy or safe to manage
as the sources suggest. Some operations seem to cause the 8042
to enter a voodoo state where all bets are off. Does anyone
know if there is a text anywhere (a book) that explains correctly
how to communicate with the 8042? Or better yet is there
any document tucked away in the IBM ftp servers which would
give their original explanation? And, an oddball question,
on my system the 0EDh (set/reset LEDs) command doesn't work
at all; perhaps it isn't supported. Is there a way to learn
whether a given command is unsupported by asking the 8042 itself?

Thanks.

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