The most significant input (A3) produces an useful inhibit function when the ’42’ is used as a 1-of-8 decoder. The A3 input can also be used as the data input in an 8-output demultiplexer application.

A seven segment display is made from seven LED (Light Emitting Diodes) segments. These segments are segments a through g and are lettered clockwise from the top segment of the display with the g ...