One side of the board contains various active and passive components. The board is surrounded by an aluminum frame and a blue plastic 22 pin male connector. There is one inspection stamp on the component side of the board. "Drum NRZ WRITER 4518 C" is printed on the solder side at the insertion end above the grid lettered A-Z. There is a large orange label on one side of the frame.
Digital Equipment Corporation (DEC)
Printed on the solder side of the board near the insertion end