The object is a large PC board. On the front is an array of 2x16 female connectors for cards with 100-pin edge connectors. On the back these 3200 connections are brought out as wire-wrap pins. Also on the back are several fuses and two socketed ICs. Etched on the lower right back is the legend "COPYRIGHT (C) 1976 BY DATA GENERAL CORP. ALL RIGHTS RESERVED 16 SLOT BACK PANEL".