Printed at top-right corner of substrate, solder-side
overall: 1/2 in x 2 1/2 in x 5 1/2 in
One (1) S181 module with green substrate and a red plastic extraction handle attached by two rivets. The handle reads "DIGITAL EQUIPMENT CORPORATION MAYNARD, MASSACHUSETTS" in raised letters on the solder-side. The substrate on the solder-side reads "DC CARRY CHAIN R 181 A" along the left-edge. "FLIP CHIP" can be read through the substrate, between the rivets on the component-side. The module has one circular, black inspection stamp near the handle. There is a repeating pattern of "NP" on the substrate.