M101

This document is a proprietary schematic diagram for a Bus Data Interface M101, created by Digital Equipment Corporation (DEC) in 1968 (Revision B).

Key features of the document:

• Purpose: Intended exclusively for test and maintenance purposes, with the circuits being proprietary.
• Circuit Design: It illustrates a digital logic circuit featuring numerous NAND gates (identified as Integrated Circuits DEC7400N) and diodes (D664/IN3606).
• Connections: Shows inputs (e.g., AI, DI, FI, JI, VI, E2), outputs (e.g., B1, E1, H1, F2), and power supply connections (+5V and ground) with filtering capacitors.
• Component List: Includes a "Parts List" section detailing the component types, such as integrated circuits, diodes, and capacitors (e.g., .01MFD 100V 20% Disc), along with their respective DEC part numbers.
• Conversion Chart: Features a "Transistor & Diode Conversion Chart" mapping DEC part numbers (e.g., D664) to EIA equivalents (e.g., IN3606).