---
title: "Technical Details for ZX Printing"
type: "article"
slug: "technical-details-for-zx-printing-2"
url: "http://localhost/article/technical-details-for-zx-printing-2/"
markdown_url: "http://localhost/article/technical-details-for-zx-printing-2.md"
published_at: "2026-03-13T00:41:05+00:00"
modified_at: "2026-03-13T00:41:05+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "In-depth technical reference covering the ZX printer interface: PR-BUFF signal, Z80 I/O port address (OOFBH), data bit meanings, stylus/belt mechanism, encoder disc operation, and key ROM routines (0802H-0918H). Also explains how to move the COPY routine to RAM and create custom character sets."
category:
  - name: "Syntax"
    slug: "syntax"
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post_tag:
  - name: "Machine language programming"
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  - name: "TS 1000"
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model:
  - name: "Timex/Sinclair 1000"
    slug: "ts-1000"
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indiv:
  - name: "Ann Zevnik"
    slug: "ann-zevnik"
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    url: "http://localhost/indiv/ann-zevnik/"
publication_r:
  id: 10246
  title: "Syntax"
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  url: "http://localhost/periodical/syntax/"
authors_r:
  - name: "Ann Zevnik"
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    url: "http://localhost/indiv/ann-zevnik/"
volume: "3"
issue: "3"
issues_articles:
  - id: 52476
    title: "Syntax/Syntax ZX80 v3 n3"
    type: "issue"
    url: "http://localhost/issue/syntax-syntax-zx80-v3-n3/"
pages: "4"
pubdate: "March 1982"
archive_link: false
---

# Technical Details for ZX Printing

In-depth technical reference covering the ZX printer interface: PR-BUFF signal, Z80 I/O port address (OOFBH), data bit meanings, stylus/belt mechanism, encoder disc operation, and key ROM routines (0802H-0918H). Also explains how to move the COPY routine to RAM and create custom character sets.