M121

This document is a proprietary schematic diagram for the Digital Equipment Corporation (DEC) M121 AND-NOR Gate, identified by part number M121-0-1, Revision C, and copyrighted in 1967.

Intended solely for test and maintenance purposes, the schematic illustrates a circuit composed of:

• Multiple DEC7450N integrated circuit AND-NOR gates (labeled E1 through E3) interconnected to perform logic functions.
• Various passive components, including resistors (330 Ohm and 750 Ohm) and capacitors (0.01 MFD, 100V).
• Notes specifying critical power connections: Pin 7 on each integrated circuit is Ground (GND), and Pin 14 provides +5V.

A detailed parts list is provided, giving specific part numbers for the integrated circuits, resistors, and capacitors used in the assembly. The document also includes revision history and drawing dates from April 1967.