---
title: "More UPD Info"
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markdown_url: "http://localhost/document/more-upd-info.md"
published_at: "2024-06-04T10:14:37+00:00"
modified_at: "2024-06-05T12:11:17+00:00"
author: "David Anderson"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "When using UPD with the Byte-Back serial units, you have to initialize the interface before you try to do any printing. This can either be done from BASIC (see Byte-Back’s documentation), or with a short machine-code routine like the following."
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  - name: "Fred Nachbaur"
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doc_author: "Fred Nachbaur"
document_url: "https://archive.org/details/syncware-news-docs/More%20UPD%20Info"
pages: 1
document_date: "198x"
related_content:
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    title: "EPROM UPD"
    type: "document"
    url: "http://localhost/document/eprom-upd/"
  - id: 10455
    title: "Universal Printer Driver"
    type: "article"
    url: "http://localhost/article/universal-printer-driver/"
  - id: 21792
    title: "The Universal Code Data Printer"
    type: "article"
    url: "http://localhost/article/the-universal-code-data-printer/"
  - id: 38978
    title: "UPD Modifications"
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    url: "http://localhost/article/upd-modifications/"
  - id: 20321
    title: "Universal Printer Driver"
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---

# More UPD Info

When using UPD with the Byte-Back serial units, you have to initialize the interface before you try to do any printing. This can either be done from BASIC (see Byte-Back’s documentation), or with a short machine-code routine like the following.