Bus Data Interface

This document is a technical schematic for a Bus Data Interface module (M100) manufactured by Digital Equipment Corporation in 1969.

Key Technical Details:

• Circuitry: The board utilizes 7400N series integrated circuits (logic gates) paired with DEC3009B transistors.

• Component Specifications:

  • Resistors are 1/4W 5% (with specific 4.7K values noted).
  • Capacitors are .01µF.
  • Diodes are D662 types.

• Power Requirements: The schematic indicates operating requirements of +5V for the ICs (pin 14) and ground (pin 7), with additional +/- voltage rails (-15V and +3V) for the interface logic.

• Organization: The layout shows eight input/output channels (A1 through V1), each controlled by a transistor switch and associated logic gates (labeled E1 through E4).
• Documentation: Includes a transistor and diode conversion chart, listing equivalent industry parts for the proprietary DEC components used on the board.