M166

This document is an engineering schematic (drawing number M166-0-1, Revision E) titled "digital +1 GATE M166," produced by Digital Equipment Corporation in 1970.

The document details the design of a digital logic circuit, likely an incrementer or counter, featuring multiple inputs and outputs, including "CRY IN" and "CRY OUT" signals. The schematic illustrates the interconnections of various integrated circuits (primarily from the DEC1074, DEC2501, and DEC3022P series), along with discrete components such as resistors, capacitors, and diodes. Power supply requirements are indicated at +5V, +3V, and +0.7V.

Accompanying the schematic are:

• A comprehensive "PARTS LIST" detailing all components by part number, description, and quantity, including ICs, passive components, and mechanical hardware like a "HANDLE, FLIP CHIP."
• Specifications for generic components (e.g., capacitors, diodes) and pin assignments for ICs (Pin 7 GND, Pin 14 +5V).
• Manufacturing-related notes, such as etched circuit board details, assembly layouts, and X-Y coordinate locations.
• A warning stating the schematic is proprietary, for test and maintenance purposes only, and copyrighted by Digital Equipment Corporation.