M665

This document is an electronic schematic and parts list for the M665 Memory Bus Transmitter, designed and copyrighted by Digital Equipment Corporation in 1971.

The schematic provides a detailed circuit diagram for the transmitter, showing interconnections of various electronic components, including:

• Integrated Circuits (ICs): Primarily DEC 3001 (labeled E1 and E2).
• Transistors: Such as DEC 65340 and DEC 3009B.
• Diodes: Including FD777, D662, and D664.
• Passive Components: Resistors, capacitors, and inductors with specified values.
• Power Rails: Indicating supply voltages like +5V, +3V, +0.8V, and -15V.

Accompanying the circuit diagram are general notes specifying default characteristics for components (e.g., resistor wattage, capacitor voltage/tolerance, IC pin assignments for ground and +5V). A comprehensive Parts List details every component required, including part numbers, descriptions (e.g., type, value, tolerance), and quantities. This list ranges from standard resistors, capacitors, and diodes to specific ICs, transistors, inductors, and even the etched circuit board itself and a "HANDLE, FLIP CHIP - MAGENTA."

The document states that the schematic is "FURNISHED ONLY FOR TEST AND MAINTENANCE PURPOSES" and that the circuitry is "PROPRIETARY."