---
title: "QL Hacker’s Journal 9"
id: 61545
type: "issue"
slug: "ql-hackers-journal-9"
url: "http://localhost/issue/ql-hackers-journal-9/"
markdown_url: "http://localhost/issue/ql-hackers-journal-9.md"
published_at: "2025-11-18T13:07:57+00:00"
modified_at: "2025-11-20T00:07:45+00:00"
author: "David Anderson"
featured_image:
  url: "http://localhost/wp-content/uploads/2025/10/Sinclair_QL_Top_cutout-scaled.png"
category:
  - name: "QL Hacker's Journal"
    slug: "ql-hackers-journal"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/ql-hackers-journal/"
periodical_issues:
  - id: 33686
    title: "QL Hacker’s Journal"
    type: "periodical"
    url: "http://localhost/periodical/ql-hackers-journal/"
number: "9"
issue_date: "June 1992"
issues_articles:
  - id: 61612
    title: "Editor’s Forum"
    type: "article"
    url: "http://localhost/article/editors-forum-9/"
  - id: 61614
    title: "New Public Domain/Freeware QL Software"
    type: "article"
    url: "http://localhost/article/new-public-domain-freeware-ql-software/"
  - id: 61616
    title: "Software Engineering and OOPS on the QL?"
    type: "article"
    url: "http://localhost/article/software-engineering-and-oops-on-the-ql/"
  - id: 61617
    title: "Random Dot Stereograms"
    type: "article"
    url: "http://localhost/article/random-dot-stereograms-2/"
  - id: 61618
    title: "Infix to Postfix"
    type: "article"
    url: "http://localhost/article/infix-to-postfix/"
  - id: 61619
    title: "Fletcher’s Checksum"
    type: "article"
    url: "http://localhost/article/fletchers-checksum/"
archiveurl: "https://archive.org/download/ql-hackers-journal/QL%20Hacker%27s%20Journal%209.txt"
---

# QL Hacker’s Journal 9