---
title: "MUF Program"
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slug: "muf-program"
url: "http://localhost/article/muf-program/"
markdown_url: "http://localhost/article/muf-program.md"
published_at: "2026-01-12T20:56:49+00:00"
modified_at: "2026-01-12T20:56:50+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Following is a ZX81 adaptation of the maximum usable frequency (MUF) program from Dec QST. Instructions: Enter CLEAR before saving a copy to tape, this saves loading time. Save program by GOTO 9990. It will then run automatically when loaded. See the QST article for details."
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model:
  - name: "Timex/Sinclair 1000"
    slug: "ts-1000"
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    url: "http://localhost/model/ts-1000/"
indiv:
  - name: "William Bosley (K3NN)"
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publication_r:
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  title: "QZX"
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  - name: "William Bosley (K3NN)"
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volume: "1"
issue: "5"
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    title: "QZX v1 n5"
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pages: "9-11"
pubdate: "April 1983"
archive_link: false
---

# MUF Program

Following is a ZX81 adaptation of the maximum usable frequency (MUF) program from Dec QST. Instructions: Enter CLEAR before saving a copy to tape, this saves loading time. Save program by GOTO 9990. It will then run automatically when loaded. See the QST article for details.