Pulsed bus transceiver 1665D system building block
The object has a green board surrounded by an aluminum frame and four blue plastic connectors. On one end the connectors are female on the other side they are male. There are several components on one side, including transistors, resistors, and capacitors. There are also 18 red transformers. At one end of the board there are brown wires that form a triangle. At the top of the triangle there are two round inspection stamps. On the solder side there is a printed circuit and a lettered grid A-Z.
Digital Equipment Corporation (DEC)
Printed on the solder side of the board in the top corner
Stamped into the female connector "Amphenol" is stamped before the number
Stamped into the side of the aluminum frame, the opposite side to the serial number