M564

This document is a proprietary electronic schematic for a -3V I.O. Bus Receiver, model M564, copyrighted by Digital Equipment Corporation and dated February 15, 1970. It is explicitly stated that the schematic is for test and maintenance purposes only.

The document includes:

• A circuit diagram illustrating the design, which features multiple input channels, each with a transistor-based input stage (Q1-Q8), followed by amplifier stages and logic gates (e.g., NAND gates).
• Details on various electronic components used, including specific transistors (e.g., DEC30098, DEC3762, DEC6534D), diodes (e.g., D664, AZ5), resistors, capacitors, and integrated circuits (primarily DEC75107).
• Power supply voltages indicated throughout the circuit, such as +5V, -15V, -5V, and -2.4V.
• A comprehensive Parts List (Bill of Materials) enumerating all components, their descriptions (e.g., diode, transistor, resistor, capacitor, heat sink, etched circuit board), and quantities.
• General specifications for components like default resistor wattage and tolerance, capacitor voltage and tolerance, and standard IC pin assignments (Pin 7 for GND, Pin 14 for +5V).
• A Transistor & Diode Conversion Chart providing equivalent part numbers for various components.