M783

This document is a schematic diagram for the Digital Equipment Corporation (DEC) UNIBUS Drivers M783, identified by part number M783-0-1.

Key information from the document includes:

• Purpose: Furnished only for test and maintenance purposes; the circuits are proprietary.
• Copyright: 1969 by Digital Equipment Corporation.
• Circuitry: It primarily depicts a digital logic circuit utilizing multiple NAND gates.

• Integrated Circuits (ICs):

  • E1, E2, and E4 are identified as DEC8881 models.
  • E3 is identified as a DEC7400 model.
  • General IC power pin assignments: Pin 7 for Ground (GND) and Pin 14 for +5V.

• Power Supply: The circuit operates with +5V and GND connections (labeled A2, +5V and C2, TI, GND).

• Capacitors:

  • C1 through C4 are specified as 0.01 MFD, 100V, 20%.
  • C5 is a 6.8 MFD, 35V capacitor.

• Inputs/Outputs: Various labeled input and output lines (e.g., BI, AI, DI, HI, FI as inputs; CI, KI, N2, T2, UI as outputs).

• Drawing Information: Drawn on November 21, 1969, with an engineering date of February 25, 1970.
• Additional: An empty "Transistor & Diode Conversion Chart" is present.