Inhibit Driver 1998 A System Building Blocks
Printed circuit board in an aluminum frame with many components that include: resistors; transistors and capacitors. "1998" etched on frame.
Digital Equipment Corporation (DEC)
||Etched on metal frame on top.
||Etched on metal frame on right side.
overall: 7 in x 4 1/2 in x 1/2 in