---
title: "MakeDOS-64 v2.1"
id: 72904
type: "computer_media"
slug: "makedos-64-v2-1"
url: "http://localhost/computer_media/makedos-64-v2-1/"
markdown_url: "http://localhost/computer_media/makedos-64-v2-1.md"
published_at: "2026-10-27T18:44:33+00:00"
modified_at: "2026-10-27T18:44:33+00:00"
author: "David Anderson"
featured_image:
  url: "http://localhost/wp-content/uploads/2026/10/boot.png"
excerpt: "Builds a 64-column disk operating system by adapting Zebra's OS-64 cartridge code to the AERCO FD-68 floppy disk interface, with printer-interface setup."
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  - name: "TS 2068"
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model:
  - name: "Timex/Sinclair 2068"
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indiv:
  - name: "Leroy Keith Watson"
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genre:
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media_type: "Diskette"
programmers:
  - name: "Leroy Keith Watson"
    slug: "keith-watson"
    taxonomy: "indiv"
    url: "http://localhost/indiv/keith-watson/"
download_url: "https://archive.org/download/timex-sinclair-software-archive/MakeDOS-64%20v2.1%20%281987%29%28Watson%2C%20Leroy%20Keith%29%28TS2068%29%28US%29%28AERCO%20Disk%29.zip"
tsrun_member: "MakeDOS-64 v2.1 (1987)(Watson, Leroy Keith)(TS2068)(US)(AERCO Disk)/disk files/BOOT.tap"
mediadate: "1987"
images:
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  - id: 21695
    title: "DOS-64: A Review"
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    url: "http://localhost/article/dos-64-a-review/"
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  - id: 13169
    title: "MakeDOS-64"
    type: "product"
    url: "http://localhost/product/makedos-64/"
media_type_tags: "DOS"
license: false
---

# MakeDOS-64 v2.1

MakeDOS-64 builds “DOS-64”: a copy of Zebra Systems’ OS-64 64-column cartridge code, modified so that the AERCO FD-68 floppy disk interface software works with it. You copy your own OS-64 cartridge into RAM (or load a copy from tape or disk), let MakeDOS patch and customise it, and save the result as a DOS-64 system file that is then moved into the DOCK bank. The menus also set the printer interface — AERCO, Tasman B or C, Oliger, A&J or another — and offer a help screen and notes on using DOS-64.

This is an AERCO disk edition. It needs a TS2068 with the AERCO FD-68 disk interface, and your own copy of the OS-64 cartridge, which is not on the disk. It has not been converted for tape. The credit screens read “Leroy Keith Watson”, © 1987, DOS-64 v21 (TRANSFER still says v20), and the program sets its version string to 2.1. The disk is labelled “LKW/RMG”.

## What’s in the download

- `MakeDOS-64_v2.1.img`: the raw AERCO disk image (single sided, 40 tracks).
- `BOOT`: credit screen; warns not to CATALOG the help screen unless DOS-64 is running, then loads and starts MakeDOSv21 with a NEW.
- `MakeDOSv21`: the MakeDOS program itself, 32,760 bytes loaded at 32768, with its colour, OS-64 load, printer-interface and SAVE/CUSTOMIZE menus.
- `TRANSFER`: pokes an 18-byte routine at 23296 that copies the OS-64 cartridge to RAM at 32768 so it can be saved to cassette with `SAVE "OS-64" CODE 32768,16384`.
- `HELP`: the DOS-64 help screen, a 64-column screen saved with both display files (an AERCO MODULE file, given as raw bytes).
- `VARS` and `vars`: a small utility at 60000 that must be called with `PRINT USR 60000`.
- `SPECTRUM`: a BASIC loader and a 17,616-byte code file that switch the TS2068 into a Spectrum mode; a NEW returns to the TS2068 so the drives can be used again.
- A README describing each file.

The author’s street address and telephone number on the credit screens have been blanked in the files and in the disk image. MakeDOSv21 also carries a note asking users of KEYWORD to send Jack Dohany a fee for rewriting it for the Timex. OS-64 is a trademark of Zebra Systems.