Diode matrix

In digital electronics, a diode matrix is a two-dimensional grid of wires, with diodes connecting at selected intersections. A single row of the diode matrix is activated at any one instant. Current flows through each diode that connects to a column. These activated columns may be used as control signals for some connected system, or may represent computer data or instructions.

A diode matrix is one technique for implementing a read-only memory. It may be used as the control store or microprogram in many early computers. A logically equivalent transistor matrix is still used as the control store or microprogram or 'decode ROM' in many modern microprocessors.

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