Read Write Switch 1975 A 00753 system building block
Digital Equipment Corporation (DEC)
1975 A 00753
Printed on the solder side of the board
Stamped into the face of the aluminum frame
Stamped into the side of the aluminum frame
overall: 1/2 in x 4 1/2 in x 7 in
The board has various resistors, diodes, and transistors, which are surrounded by an aluminum frame and blue plastic 22 pin male connector. On the solder side letters A-Z are printed along the side as a grid.