M850

This document is a proprietary electronic schematic titled "Converter and Cable Connector M850" (part number M850-0-1, Rev A), copyrighted by Digital Equipment Corporation in 1969.

It details a circuit designed for test and maintenance purposes, featuring transmit (TRANSMIT) and receive (REC) functionalities. The schematic illustrates interconnections of various components, including transistors (DEC6534B, DEC3009B types), diodes (D664, D670 types), resistors (primarily 1/4W, 5%), and capacitors.

The circuit operates with power rails including +5V, -6V, -15V, and GND, and shows various input/output points labelled H, A, E, L, and J. A transistor and diode conversion chart is provided, listing DEC part numbers with their EIA equivalents (e.g., DEC6534B to MPS6534, D664 to IN3606). General notes indicate default specifications like split lugs for connections and component tolerances.