---
title: "Annotated 4K ROM Listing – Systems Variables"
type: "article"
slug: "annotated-4k-rom-listing-systems-variables"
url: "http://localhost/article/annotated-4k-rom-listing-systems-variables/"
markdown_url: "http://localhost/article/annotated-4k-rom-listing-systems-variables.md"
published_at: "2020-10-27T17:12:00+00:00"
modified_at: "2024-06-23T00:47:36+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Listing tells you the values of all major variables used in the 4K ROM."
category:
  - name: "Syntax"
    slug: "syntax"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/syntax/"
post_tag:
  - name: "1981"
    slug: "year-1981"
    taxonomy: "post_tag"
    url: "http://localhost/tag/year-1981/"
  - name: "Reference"
    slug: "reference"
    taxonomy: "post_tag"
    url: "http://localhost/tag/reference/"
  - name: "ZX80"
    slug: "zx80"
    taxonomy: "post_tag"
    url: "http://localhost/tag/zx80/"
model:
  - name: "Sinclair ZX80"
    slug: "zx80"
    taxonomy: "model"
    url: "http://localhost/model/zx80/"
publication: "Syntax"
publication_r:
  id: 10246
  title: "Syntax"
  type: "periodical"
  url: "http://localhost/periodical/syntax/"
volume: "2"
issue: "10"
issues_articles:
  - id: 26702
    title: "Syntax/Syntax ZX80 v2 n10"
    type: "issue"
    url: "http://localhost/issue/syntax-syntax-zx80-v2-n10/"
pages: "6-7"
pubdate: "October 1981"
archive_link: false
volumeissue: "v2n10"
---

# Annotated 4K ROM Listing – Systems Variables

Listing tells you the values of all major variables used in the 4K ROM.