Device Code Select Jumper Board

Summary: This document is a technical schematic for a Digital Equipment Corporation "Device Code Select Jumper Board" (M921-0-1), dated July 1969. The schematic illustrates a grid of jumper points used to configure device codes, detailing the specific pin signal assignments for various inputs and outputs (labeled MB3 through MB8). The board uses split lugs to connect signals across the circuitry, allowing for the selection and routing of specific device codes for connected hardware.