Engineering Drawings: Chapter 10

This chapter provides essential reference information regarding DEC engineering drawings for equipment understanding and maintenance. Key topics include:

• Drawing Numbers: Explains the five-group hyphenated numbering system used for DEC drawings, identifying drawing types like block schematics, wiring diagrams, and lists.
• Circuit and Logic Symbols: Provides graphical references for circuit symbols (such as inverters and diode gates) and logic signal symbols (including standard pulses and levels).
• Logic Levels: Defines standard DEC logic levels (ground vs -3v) and their mnemonic nomenclature.
• Pulse Standards: Outlines specifications for standard pulses and FLIP CHIP R-, S-, and B-series pulses.
• Level Transitions: Describes how level transitions are notated in diagrams.
• Components: Includes a semiconductor substitution table for PDP-8 modules.
• S-Series Modules: Lists S-series modules adapted for the PDP-8 and their differences from R-series modules.
• Schematic Diagrams: Provides detailed circuit schematics for various power supplies, sense amplifiers, and memory selectors.