On Tue, Dec 10, 2002 at 10:34:44PM +0100, Pavel Machek wrote:
> > The PC only has so many possible keycodes (with E0 and E1 it's still
> > in the sub-300 range.) It won't fit within 128, but I would really
> > like an algorithmic mapping from scancodes to keycodes so we don't
> > continue to have this problem.
> >
> > For example, using a 16-bit keycode model:
> >
> >
> > Scancode Keycode (binary)
> > mxxxxxxx m0000000 0xxxxxxx
> > E0 mxxxxxxx m0000000 1xxxxxxx
> > E1 mxxxxxxx yyyyyyyy mxxxxxxx yyyyyyyy
> >
> > m = make/break bit
>
> Well, nothing prevents keyboard manufacturers from using 0xe2 as a
> prefix, too. I think there are really *weird* keyboards out there.
>
> Pavel
Indeed. See, for example,
http://www.win.tue.nl/~aeb/linux/kbd/scancodes-2.html#ss2.18
for a keyboard that uses 0x80 as a prefix.
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