---
title: "Totally Safe Machine Code for the ZX81 and TS1000"
type: "article"
slug: "totally-safe-machine-code-for-the-zx81-and-ts1000"
url: "http://localhost/article/totally-safe-machine-code-for-the-zx81-and-ts1000/"
markdown_url: "http://localhost/article/totally-safe-machine-code-for-the-zx81-and-ts1000.md"
published_at: "2020-10-27T17:09:05+00:00"
modified_at: "2025-11-04T13:21:01+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Tips for writing safe machine code."
category:
  - name: "T-S Horizons"
    slug: "t-s-horizons"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/t-s-horizons/"
post_tag:
  - name: "Machine language programming"
    slug: "machine-language"
    taxonomy: "post_tag"
    url: "http://localhost/tag/machine-language/"
  - name: "TS 1000"
    slug: "ts1000"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts1000/"
  - name: "Type-in program"
    slug: "type-in-program"
    taxonomy: "post_tag"
    url: "http://localhost/tag/type-in-program/"
  - 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: "William J. Pedersen"
    slug: "william-j-pedersen"
    taxonomy: "indiv"
    url: "http://localhost/indiv/william-j-pedersen/"
publication: "T-S Horizons"
publication_r:
  id: 10247
  title: "T-S Horizons"
  type: "periodical"
  url: "http://localhost/periodical/t-s-horizons/"
authors: "William J. Pedersen"
issue: "21"
issues_articles:
  - id: 26864
    title: "T-S Horizons n21"
    type: "issue"
    url: "http://localhost/issue/t-s-horizons-n21/"
pages: "10"
pubdate: "December 1986"
archive_link: false
volumeissue: "vn21"
---

# Totally Safe Machine Code for the ZX81 and TS1000

Tips for writing safe machine code.