Multiplexer Switch 1578 A system building block
Digital Equipment Corporation (DEC)
||Printed on the solder side at the insertion end
||Etched on the face of the aluminum frame
||Etcvhed on the side of the aluminum frame
overall: 1/2 in x 4 1/2 in x 7 in
The board has many components of varying type surrounded by an aluminum frame and a blue plastic 22 pin male connector. There is a red sticker on the side of the frame that reads "Model 1578 5/4/63".