What is a diode array matrix ?
JB_AU: What is a diode array matrix ?
Do you mean this thing?
The original Read Only Memory?
...or a Light Emmitting Diode Array Matrix like this? http://www.ebay.co.uk/itm/Super-Bright-RGB-LED-matrix-3mm-Red-square-8x8-16pin-/221260826770?pt=LH_DefaultDomain_0&hash=item33842c4892
So one would read the lettered pins, all would be High unless one of the numbered pins was low?
CrossRoads: So one would read the lettered pins, all would be High unless one of the numbered pins was low?
No, wrong way round. Read the numbered pins as a byte and some columns will be pulled low by a lettered pin. Columns with no diode will remain high for that row.
The letters correspond to a musical scale - possibly an encoder for some sort of synthesiser.
I'll take reply #6 & put that page in my too hard basket, but thanks though to all.