M516

This document is a schematic diagram for a Digital Equipment Corporation (DEC) M516 Positive Bus Receiver. Dated June 20, 1968, it explicitly states the circuits are proprietary and for test and maintenance purposes only, copyrighted by DEC.

The diagram details the circuit's construction, featuring integrated circuits (ICs) (specifically DEC7420N, part #1905577), numerous resistors (various values from 220 Ohms to 1.5 kOhms, all 1/4W 5% CC), diodes (D662 and D664, with EIA equivalents IN645 and IN3606 respectively), and capacitors (0.01 MFD 100V 20% Disc).

Key operational notes indicate that Pin 7 on each IC connects to Ground and Pin 14 to +5V. A comprehensive parts list provides reference designations, descriptions, and corresponding part numbers for all components. The document's number is M516-0-1.