Type 164 Magnetic Core Memory System Instruction Manual

This document is an instruction manual for the Digital Equipment Corporation's Type 164 Magnetic Core Memory System, designed for the PDP-6 computer. It provides a comprehensive overview covering the system's introduction, detailed technical descriptions, installation guidelines, operational procedures, specific memory modules, and extensive maintenance instructions.

The manual begins by outlining the system's purpose, characteristics (such as 16K, 36-bit word capacity, 1.65 µs cycle time, physical dimensions), and required documentation. It then proceeds with installation details, including cabling, termination requirements, cabinet specifications, and the functionality of the indicator panel and switches for basic operation and status monitoring.

A significant portion is dedicated to the system's internal workings, explaining the block diagram, central processor interface, memory control logic (X/Y-selection, inhibit, sense, timing, data flow), and the function of special memory modules like sense amplifiers and memory selectors. For upkeep, the document details a complete maintenance regimen, including diagnostic programs (MAINDEC), preventive maintenance schedules, and troubleshooting guides for various system failures and malfunctions. It also includes a tune-up procedure for optimal performance. Finally, an appendix covers the optional Type 169 Parity Option, describing its installation, controls, and theory of operation, including write/read cycles with parity checking and error handling.