> Well, I'd hardly count that as a matrix keyboard, since one axis of
> the "matrix" is of size 1.

You're right, I didn't notice the "matrix" keyword ;)

For a matrix keyboard, I never seen anything but a scanning mechanism.
However, it is still possible to imagine, e.g. a system where each key
would connect to a different voltage, and so it would stille be possible
to tell which raw/column was activated.

Ex for a 3x3 :

	1V  2V  5V
1 V ----X---X---X---\
2 V ----X---X---X----+
5 V ----X---X---X---/
	|   |   |
	\   |   /
         \  |  /
            +


In this system, each key must be a double-switch (raw/column) and you
can't detect more than one simultaneous keypress...


Vincent