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pdp-1144

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PDP-11/44

The PDP-11/44 is a high-performance microprogrammed minicomputer introduced by Digital Equipment Corporation (DEC) in 1978. It operates on a 16-bit architecture, featuring an enhanced instruction set and improved memory management compared to its predecessors.

Key Features

  • Processor: 300 ns cycle time (upgradable to 250ns), with microprogramming support.
  • Memory: Supports up to 4MB of physical RAM; the standard model comes with 64KB.
  • Storage Devices: Can be equipped with a variety of magnetic tape, disk packs, and drum storage systems.

Historical Context

The PDP-11/44 was designed for demanding applications requiring high-speed computing capabilities. It found use in various industries including manufacturing, scientific research, and education, serving as a bridge between the early minicomputers and later personal computers.

Technical Specifications

  • Clock Speed: Base configuration is 6 MHz.
  • Bus Width: The system uses a 16-bit data path and a 22-bit address space.
  • Input/Output Channels: Supports several channels for interfacing with various peripherals such as printers, terminals, and storage devices.

Modern Relevance

The PDP-11/44’s role in the development of computing technology is significant. It demonstrates how advances in hardware can enable complex computational tasks long before modern computing standards were established.

Demystifying AI on a 1979 PDP-11

  • Presenter: Dave (Dave’s Garage)
  • URL: https://www.youtube.com/watch?v=OUE3FSIk46g
  • Summary:
    • The video presents the training of a neural network transformer on a vintage PDP-11/44, illustrating how such tasks were approached before the advent of modern GPUs and cloud computing.
    • Challenges include running with only 6MHz CPU speed and limited RAM (initially 64KB, later expanded to 4MB).
    • The video emphasizes that AI’s complexity is not due to hardware capabilities but rather advancements in algorithms and data processing techniques.

2026 04 13 Demystifying AI Transformer Training on a 1979 PDP 11

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