Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 18 Aug 2003 14:22:35 +0200 (MET DST) | From | "Maciej W. Rozycki" <> | Subject | Re: Input issues - key down with no key up |
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On Sun, 17 Aug 2003, Vojtech Pavlik wrote:
> > What are the known problems with mode #3, then? > > It's broken on many keyboards (on some only slightly, like some keys not > working properly). Other (special, either unix workstation or point of > sale) keyboards need it to work properly.
IIRC, OSF/1 running on later Alphas with a PS/2 keyboard interface (earlier oned had an LK201 one) uses mode #3. I can't comment on the VMS.
> > That is, why doesn't everyone use it and why haven't they always used it? > > Because old AT keyboards didn't support it. Because the XT keyboard > didn't support it. Because history sticks.
Since the 8042+keyboard combo supports a PC/XT compatibility mode there was no incentive -- why bother modifying software if the hardware works with the old one? Even if that sucks.
> > For that matter, what does Windows use? > > Translated Set 2. Actually an emulated XT keyboard.
For mode #3 explicit handling for hot-plugging would be required -- I guess the change would be much too intrusive. And untranslated mode #2 is nearly the same as an emulated PC/XT keyboard: codes are different and the release bit is replaced by the release code, but the multibyte mess for PS/2-specific keys remains -- no gain at all.
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +
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