W501 module with green substrate and a beige, plastic extraction handle attached by two rivets. Handle reads "DIGITAL EQUIPMENT CORPORATION MAYNARD, MASSACHUSETTS." Reverse side of substrate reads " SCHMITT TRIGGER W 501" along the edge. Obverse side has several components and is marked with three inspection stamps; "FLIP CHIP" can be read through substrate, between rivets.
Digital Equipment Corporation (DEC)
Located on outer-face of tan, plastic extraction handle