Digital to analogue conv 1561B00659 system building block
Digital Equipment Corporation (DEC)
Printed in solder near the insertion end
Stamped into the face of the frame
Stamped into the aluminum frame at the side
overall: 1/4 in x 4 1/2 in x 7 in
The object consists of a green board and a blue plastic connector. The board is surrounded by an aluminum frame. There are 11 piezo buzzers and several transistors. On the other side there is a solder circuit.