Flip chip extender board. The top of the board is black plastic with "1712-18-PCC" printed on the side in white. "EXTENDER MODULE W980B" and "12-67" are printed on the obverse of the green circuit board. "FLIP CHIP" is printed on the reverse.
Digital Equipment Corporation (DEC)
Maynard, Massachusettes, U.S.A.
Located on the side of the black plastic portion of the extender board