> > > > By micro, I mean something appx 1/4 the size of the HPLX
> > > > keyboards, and wrist mounted. This would be the size of an
> >
> > The only thing that springs to mind, is the "credit card"
> > organizers
>
> I've stared at these a long moment at the counter at Radio Shack too
> and
> thought, these would make nice tiny keyboards, but you lose me
> further down..
Where did I lose you? I'd be more than happy to explain.
> > The matrix does not require discrete *buttons,* but only contact
> > between 2 conductors. :-)
>
> yep, get that. :)
OK...so far so good.
> > Casing -- we're talking custom work. You could always hack the
>
> well the organizer has a small grid of buttons and probably a thin
> contact
> board underneath that could easilly be slapped onto something more
The "contact board" on my organizer is the matrix itself -- a series
of conductors with a "gap" that's bridged by the conductive rubber
pad on the bottom of each key.
The matrix is the part that would need to be replaced / reengineered
by us. The "SIMM" stick is the controller board -- the newer keyboards
have such a tiny controller board that it resembles a standard SIMM.
My suggestion was not to interface the organizer to the keyboard port,
but to replace the innards with PS/2 hardware and convert it *into* a
PS/2 keyboard.
> Okay, now you lost me. What SIMM stick are you talking about here? I
There is a controller board within all standard PS/2 keyboards.
Attached to this is a conductive matrix of the type mentioned above.
The controller board in a modern keyboard is tiny and resembles
a SIMM.
> Even if there was it probably doesn't encode things into a nice
> serial
> steam or ps/2 encoded stream. But maybe it does. Have you tried
> this?
PS/2 keyboard specs indicate a serial data stream as its output,
and this should be simple enough to "broadcast" to a receiver.
Have I tried it? No... But the wireless keyboards work this way.
-- Chuck Knight
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