---
title: "Letters: Interfacing the ZX81"
type: "article"
slug: "letters-interfacing-the-zx81"
url: "http://localhost/article/letters-interfacing-the-zx81/"
markdown_url: "http://localhost/article/letters-interfacing-the-zx81.md"
published_at: "2020-10-27T17:08:52+00:00"
modified_at: "2024-05-26T14:36:57+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Interfacing using a variety of relays."
category:
  - name: "Radio Electronics"
    slug: "radio-electronics"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/radio-electronics/"
post_tag:
  - name: "TS 1000"
    slug: "ts1000"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts1000/"
  - name: "ZX81"
    slug: "zx81"
    taxonomy: "post_tag"
    url: "http://localhost/tag/zx81/"
model:
  - name: "Sinclair ZX81"
    slug: "zx81"
    taxonomy: "model"
    url: "http://localhost/model/zx81/"
  - name: "Timex/Sinclair 1000"
    slug: "ts-1000"
    taxonomy: "model"
    url: "http://localhost/model/ts-1000/"
indiv:
  - name: "Robert Parent"
    slug: "robert-parent"
    taxonomy: "indiv"
    url: "http://localhost/indiv/robert-parent/"
publication: "Radio Electronics"
publication_r:
  id: 10236
  title: "Radio Electronics"
  type: "periodical"
  url: "http://localhost/periodical/radio-electronics/"
authors: "Robert Parent"
volume: "56"
issue: "4"
pages: "20, 22"
pubdate: "April 1985"
archive_link: false
archiveurl: "https://archive.org/download/radio_electronics_1985-04/Radio_Electronics_April_1985.pdf"
volumeissue: "v56n4"
---

# Letters: Interfacing the ZX81

Interfacing using a variety of relays.