---
title: "TOPS CP/M Public Domain Disk"
id: 73004
type: "computer_media"
slug: "tops-cp-m-public-domain-disk"
url: "http://localhost/computer_media/tops-cp-m-public-domain-disk/"
markdown_url: "http://localhost/computer_media/tops-cp-m-public-domain-disk.md"
published_at: "2026-10-27T21:30:04+00:00"
modified_at: "2026-10-27T21:30:04+00:00"
author: "David Anderson"
featured_image:
  url: "http://localhost/wp-content/uploads/2026/10/tops-cpm-pd-disk.jpg"
excerpt: "The 1987 TOPS public domain CP/M disk for the Timex FDD 3000: file transfer, directory and copy tools, the VDE editor, a library utility and a Z80 debugger."
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model:
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indiv:
  - name: "Dave Franson"
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    url: "http://localhost/indiv/dave-franson/"
genre:
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media_type: "Diskette"
programmers:
  - name: "Dave Franson"
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    taxonomy: "indiv"
    url: "http://localhost/indiv/dave-franson/"
download_url: "https://archive.org/download/timex-sinclair-software-archive/TOPS%20CPM%20Public%20Domain%20Disk%20%281987%29%28Franson%2C%20Dave%29%28TS2068%29%28US%29%28Diskette%29.zip"
mediadate: "1987"
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  - id: 33927
    title: "Dave Franson"
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    url: "http://localhost/company/dave-franson/"
images:
  - url: "http://localhost/wp-content/uploads/2026/10/tops-cpm-pd-disk.jpg"
article_media:
  - id: 21664
    title: "A TOS (Zebra) Disk Newsletter"
    type: "article"
    url: "http://localhost/article/a-tos-zebra-disk-newsletter/"
  - id: 62943
    title: "It’s About Time … or What Ever Happened to the FDD Newsletter?"
    type: "article"
    url: "http://localhost/article/addendum-errata-3/"
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  - id: 12543
    title: "FDD 3000 Disk Drive system"
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    url: "http://localhost/product/fdd-3000-disk-drive-system/"
  - id: 11640
    title: "64K CP/M 2.2 Option"
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    url: "http://localhost/product/64k-cp-m-2-2-option/"
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  - id: 44357
    title: "TOPS (Timex of Portugal Systems)"
    type: "periodical"
    url: "http://localhost/periodical/tops-timex-of-portugal-systems/"
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    title: "TOPS subscribers"
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media_type_tags: "Collection"
license: false
---

# TOPS CP/M Public Domain Disk

The TOPS CP/M Public Domain Disk collected public-domain CP/M programs for owners of the Timex FDD 3000 drive running CP/M. It was distributed through TOPS (Timex of Portugal Systems), the newsletter Dave Franson started for the drives. Its `README.TXT` is headed “TOPS CP/M PUBLIC DOMAIN DISK CONTENTS 05/19/87”.

- Side A: `BINRX` and `BINTX` (binary file transfer, described in the first issue of the TOPS newsletter), `COMTOHEX` (turns a program into an Intel HEX text file, for sending BINTX to the machine you are downloading from), `D` and `SD` (directory listers), `DISK76` (a file copy utility that replaces many PIP functions), `VDE` (a WordStar-like editor configured for the FDD 3000 with a Timex 2068 running the Monitor Emulator) with `VDE.TXT` and `VINSTALL`, `COMPARE`, `HEXD` (hex dump) and `UNERA` (unerase).
- Side B: `DDTZ` (DDT with Z80 mnemonics) and the `NULU` library utility with its documentation `NULU.TXT`. The side also has `PIP` and `COPY` from the CP/M system disk.

Side A survives in two reads of two different copies, which failed on different sectors. The download’s side A image combines them: 12 unreadable sectors of the first read were filled from the second, which has the same directory and layout. After the merge every side A program is complete. Side B exists in one read only, and `NULU.TXT` has one unreadable 256-byte gap. Both disk images and all files are included. The disk needs CP/M 2.2 on the FDD 3000.