AW: AW: Matrix board! (a CMOS one)

[Haible Juergen]

	>According to the statement "during power up, all switches are
automatically
	<reset", I assume that it can turn on more than one switch at a
time. 

That alone would not help at all. If it's just switches, it would more or
less short 
whole columns and rows together.
Example:
Asuming A, B, C, .... are the inputs and #1, #2, #3, ... are the outputs.
You want A to modulate #2, and
both A and C to modulate #1.
So you'd set the connections A#2, A#1 and C#1.
If it's all just switches, the whole A and C input rows would be wired
together
(over their connection with #1). Therefore you would also have an
unintentional
modulation path from C to #2 (amongst other side effects).
What you need is a resistive connection for each matrix element, with the
input
rows being buffered and the output columns being true summing nodes.
It would not be completely out of reach to integrate such a scheme
(transmission
gates are not perfect shorts), but I have my doubts that this implemented in
these arrays.

JH.