8K, 12 Bit Base Board

This document contains the engineering schematics and parts lists for an 8K, 12-bit core memory stack and its associated base board assembly (PDP-8A memory).

Key contents include:

• Schematics: Detailed circuit diagrams for the memory stack, timing controls, X and Y drive circuitry, and sense/inhibit lines for the 12 memory bits (0–11).
• Parts Lists: Comprehensive tables listing reference designations, descriptions, and Digital Equipment Corporation (DEC) part numbers for all components (resistors, capacitors, transistors, ICs, transformers, and diodes).
• Technical Specifications: Definitions of jumper configurations for memory addressing (8K to 32K selection), pin layouts for integrated circuits, and voltage requirements (+5V, +20V).
• Notes: Assembly instructions, including component substitutions for memory testing and usage specifications for specific connectors and boards.