Dual DC Sense Amplifier 4553B system building block
Digital Equipment Corporation (DEC)
Printed on the solder side at the insertion end
Stamped into the side of the frame
Stamped into the side of the aluminum frame
overall: 1/2 in x 4 1/2 in x 10 1/2 in
The board is densely populated with various components and wires, which are surrounded by an aluminum frame and a blue plastic 22 pin male connector. At the end opposite the connector there are four insertion points, two are red and two are black. There are two small holes, one on either side of the serial number, in the aluminum frame.