---
title: "ZX81 Tips"
type: "article"
slug: "zx81-tips"
url: "http://localhost/article/zx81-tips/"
markdown_url: "http://localhost/article/zx81-tips.md"
published_at: "2022-01-23T01:22:09+00:00"
modified_at: "2024-05-26T13:40:58+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "PEEKs to find the number of characters in the first line of a program and to prevent accidental screen overflow."
category:
  - name: "Sinc-Link"
    slug: "sinc-link"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/sinc-link/"
post_tag:
  - name: "TS 1000"
    slug: "ts1000"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts1000/"
  - name: "Tutorial"
    slug: "tutorial"
    taxonomy: "post_tag"
    url: "http://localhost/tag/tutorial/"
model:
  - name: "Timex/Sinclair 1000"
    slug: "ts-1000"
    taxonomy: "model"
    url: "http://localhost/model/ts-1000/"
publication_r:
  id: 10240
  title: "Sinc-Link"
  type: "periodical"
  url: "http://localhost/periodical/sinc-link/"
volume: "4"
issue: "3"
issues_articles:
  - id: 38195
    title: "Sinc-Link v4 n3"
    type: "issue"
    url: "http://localhost/issue/sinc-link-v4-n3/"
pages: "2"
pubdate: "May/June 1986"
archive_link: false
---

# ZX81 Tips

PEEKs to find the number of characters in the first line of a program and to prevent accidental screen overflow.