Multiplex A131

Summary: This document is a technical schematic for a Digital Equipment Corporation "Multiplex" circuit board (A131), dated 1969. The circuit utilizes a series of logic gates (E1, E2, E3) and an array of transistors (Q1 through Q25) to manage signal distribution. The schematic includes a detailed parts list specifying the required integrated circuits, transistors, diodes, resistors, and capacitors, along with power requirements for the +5V, +15V, and -15V rails. It also includes pinout information for the integrated circuits and general maintenance/test purpose instructions.