F17 PDP1Maint

This document is the Maintenance Manual for the Digital Equipment Corporation (DEC) Programmed Data Processor-1 (PDP-1), identified as Technical Bulletin F-17, copyrighted 1962. It contains proprietary information intended for DEC customers to properly use and maintain their PDP-1 equipment.

Purpose and Scope: The manual aims to assist personnel with the installation, operation, and maintenance of the PDP-1. It provides a complete description of the standard PDP-1 and its optional central processor additions. Peripheral input-output equipment options are covered in separate supplements.

System Overview (as described in the introduction): The PDP-1 is a compact, solid-state, general-purpose digital computer known for its speed, flexibility, and programming power.

• Speed: Utilizes five-megacycle solid-state logic circuits, an 18-bit fully parallel processor, and a random-access magnetic core memory with a 5-microsecond cycle time, achieving a computation rate of 100,000 additions per second.
• Flexibility: Designed to accommodate a wide variety of input-output (I/O) equipment without internal machine changes. Standard I/O includes an alphanumeric typewriter, photoelectric tape reader, and paper tape punch. Optional I/O devices (e.g., CRT displays, magnetic tape units, card punch) and central processor options (e.g., memory extension, automatic multiply/divide unit, high-speed data channels, a 16-channel sequence break system) are available.
• Programming: A single-address, single-instruction stored program machine operating on 18-bit 1's-complement binary numbers, with features like multiple-step indirect addressing.
• Storage: Basic memory is 4,096 18-bit words, expandable to 65,536 words with extensions.
• Physical: Housed in standard DEC bays with steel frames and aluminum control panels. It uses solid-state logic (transistors and crystal diodes) and operates on ordinary 117-volt, 60 Hz, single-phase current.

Manual Organization: The manual is divided into 11 chapters:

1. Introduction: Outlines the manual's purpose, scope, and organization.
2. General Description: Provides a high-level overview of the PDP-1 system, including its purpose, standard equipment, available options, operating specifications, physical characteristics, power requirements, and equipment listings (down to individual modules).
3. System Function: Describes the logical organization of the computer, program execution, various computer cycles (e.g., cycle zero, defer, interruption), instruction control, program control, and standard I/O operations at a block-diagram level.
4. Installation: Guides personnel through initial setup, unpacking, installation of standard I/O equipment, and preoperational checks.
5. Operating Procedures: Explains the use of console controls, indicators, standard I/O equipment, and various computer operating modes, including checklists for common operations.
6. Control: Details the general control functions of the computer, instruction control, program control, shift/rotate logic, memory address/buffer transfer logic, and sequence break/high-speed channel control systems.
7. Arithmetic Unit: Explains the registers and logic involved in arithmetic and logical operations, including the accumulator, in-out register, and optional automatic multiply/divide logic.
8. Memory: Covers the operation of the core-memory system, including addressing, buffer register, memory modules, and memory extension control.
9. Input-Output System: Describes the control of standard and optional I/O equipment, including the in-out transfer control, input mixer, tape reader, tape punch, and typewriter controls.
10. Circuit Description: Provides function, specifications, and theory of operation for the 52 circuit modules used in the PDP-1 system, as well as power supplies and controls.
11. Maintenance: Offers information for adjustment, calibration, troubleshooting, recommended spare parts, preventive maintenance schedules, and module repair procedures.

Logic diagrams are provided in a separate D-size package, while other figures (photographs, block diagrams, circuit schematics) are included at the back of the manual.