W122

This document is a circuit schematic for a Digital Equipment Corporation (DEC) Bus Transceiver, model WI22 (part number WI22-0-1).

Key information provided:

• Purpose: Furnished only for test and maintenance, considered proprietary, and copyrighted by DEC in 1969.
• Circuit Details: A detailed diagram illustrating the connections of various electronic components, including transistors (e.g., DEC3009B, DEC4258), diodes (e.g., D662, D664, IN753A), resistors, capacitors, and inductors (L1-L4).
• Component Specifications: Default values are provided for components not individually specified, such as capacitors (0.1mfd, 100V, 20%), diodes (D664), transistors (DEC4258), resistors (1/4W, 5%), and inductors (L1-L4 are 2.2µh chokes, 1/4W, 10%).
• Conversion Chart: A "Transistor & Diode Conversion Chart" lists DEC part numbers and their corresponding EIA equivalents (e.g., D664/IN3606, D662/IN645, DEC3009B/2N3009B, DEC4258/NONE, DECIN753A/SAME).
• Revisions: The document is at Revision D, with various drawing, checking, and engineering dates listed around late 1968 to mid-1970.