I/O Bus Receiver Ckt.

This document is a technical schematic diagram for an I/O Bus Receiver circuit (W107), produced by Digital Equipment Corporation in 1967. The circuit utilizes an array of transistors (DEC 3639B/C) and diodes (D664) to manage input/output signals. It is designed for maintenance and testing purposes, specifying component values for resistors (1/4W, 5%) and capacitors, while operating between +10V and -15V power rails. The document also includes a conversion chart for the transistors and diodes used in the design.