---
title: "Interfacing Tips and Troubles: Memory Mapped I/O on the Sinclair ZX81"
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published_at: "2020-10-27T17:13:07+00:00"
modified_at: "2024-05-26T14:33:59+00:00"
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excerpt: "Memory-mapped IO on a Timex/Sinclair computer."
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authors: "Neil Bungard"
issue: "17"
pages: "28-29"
related_articles:
  - id: 20356
    title: "Interfacing Tips and Troubles: Interfacing the Sinclair Computers, Part One"
    type: "article"
    url: "http://localhost/article/interfacing-tips-and-troubles-interfacing-the-sinclair-computers-part-one/"
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    title: "Interfacing Tips and Troubles: Interfacing the Sinclair Computers, Part Two"
    type: "article"
    url: "http://localhost/article/interfacing-tips-and-troubles-interfacing-the-sinclair-computers-part-two/"
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---

# Interfacing Tips and Troubles: Memory Mapped I/O on the Sinclair ZX81

Memory-mapped IO on a Timex/Sinclair computer.