--- title: "The Flags of the 8K ROM Program" type: "article" slug: "the-flags-of-the-8k-rom-program" url: "http://localhost/article/the-flags-of-the-8k-rom-program/" markdown_url: "http://localhost/article/the-flags-of-the-8k-rom-program.md" published_at: "2024-01-01T13:14:31+00:00" modified_at: "2024-06-23T01:03:41+00:00" featured_image: url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg" excerpt: "The ZX81 manual states that the three system variables FLAGS, FLAGX and CDFLAG hold various flags to control the BASIC system. But a study of the 8K ROM program discloses 12 separate flags." category: - name: "Syntax" slug: "syntax" taxonomy: "category" url: "http://localhost/category/periodicals/syntax/" post_tag: - name: "1982" slug: "year-1982" taxonomy: "post_tag" url: "http://localhost/tag/year-1982/" - 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: "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: "Ian Logan" slug: "ian-logan" taxonomy: "indiv" url: "http://localhost/indiv/ian-logan/" publication_r: id: 10246 title: "Syntax" type: "periodical" url: "http://localhost/periodical/syntax/" authors: "Ian Logan" volume: "3" issue: "2" issues_articles: - id: 52471 title: "Syntax/Syntax ZX80 v3 n2" type: "issue" url: "http://localhost/issue/syntax-syntax-zx80-v3-n2/" pages: "6-7" pubdate: "February 1982" related_articles: - id: 52491 title: "New 8K ROM Routine Addresses" type: "article" url: "http://localhost/article/new-8k-rom-routine-addresses/" - id: 52501 title: "Bar Chart" type: "article" url: "http://localhost/article/bar-chart-2/" archive_link: false --- # The Flags of the 8K ROM Program The ZX81 manual states that the three system variables FLAGS, FLAGX and CDFLAG hold various flags to control the BASIC system. But a study of the 8K ROM program discloses 12 separate flags.