Re: keyboard scancodes

Derek Fawcus (derek@spider.com)
Sun, 12 Dec 1999 20:21:13 +0000

On Sat, Dec 11, 1999 at 10:12:36AM +0100, Vojtech Pavlik wrote:
>
> All i8042's I've tested (and I've tested a lot of them) support
> switching the AT->XT conversion off. Most keyboards (not all,
> but that isn't too big a problem) support switching the AT emulation
> off, too.

Agreed on the i8042 translation, a few years ago I tested this in
embedded PC environments, and every board I found allowed they keyboard
controller translation to be turned off. This would increase the amount
of data sent (f0 prefix for down code if I remember correctly), but
subsequent translation is a hell of a lot simpler.

If by the keyboard switching, you're referring to the scan set it
supplies (set1/set2/set3), then there is a problem. For some of the
keyboards I tested, changing out of the normal set (set2 I think)
would crash the keyboard. The only way to then recover was to power
cycle the keyboard.

DF

-- 
Derek Fawcus                                                    derek@spider.com
Spider Software Ltd.                                        +44 (0) 131 475 7034
PGP/GnuPG Keys available


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