---
title: "The ZX81 Companion"
type: "article"
slug: "the-zx81-companion"
url: "http://localhost/article/the-zx81-companion/"
markdown_url: "http://localhost/article/the-zx81-companion.md"
published_at: "2020-10-27T17:19:15+00:00"
modified_at: "2024-06-23T07:48:30+00:00"
featured_image:
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excerpt: "The ZX81 Companion, like other ZX81 books, is totally applicable to the TS1000. It begins with a chapter on graphics techniques. First the screen field is explained. Then PLOT and UNPLOT are used to develop the basic components in graphics: drawing straight lines, using triangles, circles, parabolas, and ellipses, and moving a point around the…"
category:
  - name: "SYNC"
    slug: "sync"
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    url: "http://localhost/category/periodicals/sync/"
post_tag:
  - name: "1983"
    slug: "year-1983"
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    url: "http://localhost/tag/year-1983/"
  - name: "Book review"
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    url: "http://localhost/tag/book-review/"
  - 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: "Paul Grosjean"
    slug: "paul-grosjean"
    taxonomy: "indiv"
    url: "http://localhost/indiv/paul-grosjean/"
publication: "Sync"
publication_r:
  id: 10243
  title: "SYNC"
  type: "periodical"
  url: "http://localhost/periodical/sync-magazine/"
authors: "Paul Grosjean"
volume: "3"
issue: "5"
issues_articles:
  - id: 26651
    title: "SYNC v3 n5"
    type: "issue"
    url: "http://localhost/issue/sync-v3-n5/"
pages: "73"
pubdate: "September/October 1983"
archive_link: false
volumeissue: "v3n5"
---

# The ZX81 Companion

The ZX81 Companion, like other ZX81 books, is totally applicable to the TS1000. It begins with a chapter on graphics techniques. First the screen field is explained. Then PLOT and UNPLOT are used to develop the basic components in graphics: drawing straight lines, using triangles, circles, parabolas, and ellipses, and moving a point around the screen. After the PRINT AT instruction is discussed, it is combined with INKEY$ to create realtime programs.