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An inflatable keyboard, manufactured from two layers of plastic, with the contacts on either side of small air-bladders.
When not required, the keyboard is deflated and folded into a storage compartment on the PDA. When needed the user inflates the keyboard and by 'squishing' the air from the bladders
causes the key contacts to close registering a keypress.
Admittedly this wouldn't be suitable for a touch typist (or anyone for long periods) but it would be better than the current 3 letter per key arrangement used on phones.
not like this
but why does this exist? [rbl, Oct 04 2004, last modified Oct 17 2004]
Half-way down the page. [8th of 7, Oct 04 2004, last modified Oct 17 2004]
||In the Star Trek: The Next Generation episode "Lessons", Neela Daren plays a duet with Jean-Luc on a "roll-out" piano-like keyboard; which would be similar to this idea. Flexible keyboards are Baked (link).
||Inflating the keyboard with positive pressure would give it more rigidity and might improve its feel and useability.
||Imagine trying to do a CTRL-ALT-DEL though...