M126

This document is a schematic diagram for a digital circuit board titled "SIX 2-2 AND-NOR GATES M126," with the drawing number M126-0-1 Revision B, copyrighted by Digital Equipment Corporation in 1970.

Key features of the document include:

• Circuit Diagram: It illustrates the interconnection of several integrated circuits (ICs) labeled E1, E2, and E3, which function as AND-NOR gates, along with associated capacitors, resistors, and diodes.
• Power Conditioning: A section of the circuit depicts power supply components, indicating voltage rails such as +5V, +2.8V, and +0.7V, along with ground (GND).
• General Component Specifications: Notes provide default specifications for capacitors (0.01uF, 100V, 20%), diodes (D662), and ICs (DEC1074H50), including standard pin assignments for power (+5V on Pin 14, GND on Pin 7).
• Parts List: A comprehensive table enumerates all required components, providing DEC part numbers, descriptions (e.g., "HANDLE, FLIP CHIP - MAGENTA," "I.C. DEC 1074H50," various capacitors, resistors, diodes), and quantities. It also lists the etched circuit board itself and module history/layout documents.
• Transistor & Diode Conversion Chart: A small chart provides conversions for DEC diode part numbers (D662, D664) to their EIA equivalents (IN645, IN3606).
• Proprietary Information: A header states that the schematic is for test and maintenance purposes only, and the circuits are proprietary to Digital Equipment Corporation.

The document provides a detailed technical blueprint for the "SIX 2-2 AND-NOR GATES M126" module, including both its logical structure and bill of materials.