G212

This document is a proprietary schematic diagram for a "Memory Common Driver G212" circuit, created by Digital Equipment Corporation in 1966.

Key features and information include:

• Purpose: Intended for test and maintenance purposes.
• Circuit Design: It depicts a circuit featuring four main driver stages, each built around a DEC 2894-3A transistor and a T-2050 transformer, along with numerous supporting diodes (e.g., D662, D664, D670), resistors, and capacitors.
• Inputs/Outputs: Various labeled input points (e.g., AJ, AL, AP, AS) and output/power connections (e.g., AC, BC, GND, -15V) are shown.
• Component Specifications: Default specifications are provided for resistors (1/4W 5% or 10%), capacitors (MMFD), diodes (D664), and transistors (DEC1010), unless otherwise indicated.
• Conversion Chart: A "Transistor & Diode Conversion Chart" provides cross-references between DEC part numbers (e.g., DEC1010, DEC2894-3A, D664, D670) and their EIA equivalents (e.g., IN645, IN3606, IN3653).
• External References: It refers to a "Parts List is A-PL-6212-0-0" and instructs to "USE THE ETCH BOARD OF THE S206".