Case study

geoWrite 2.1: source that rebuilds the original binaries

Reverse-engineered cc65 source for geoWrite 2.1, the GEOS word processor, in English and German. The README says a standard compile generates binaries identical to the English and German geoWrite 2.1 distribution binaries. The orig tree holds the collected original versions.

Targets: Binary
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-04

Stars: 70
Last commit: 2022-11-13
Language: Assembly

GitHub data as of 2026-11-09

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Requirements & limits

Requires make, cc65 and Python for protected-code encryption. make builds the English version; LOCALE=de make builds the German version. The orig/ directory contains the original binaries.
A standard compile rebuilds the GEOS-bundled English and German geoWrite 2.1 binaries byte for byte; source comments remain incomplete.
The README places new reverse-engineered work in the public domain, requests credit and asks users to respect the underlying GEOS license. The repository root has no LICENSE file.

Cite

BibTeX

@misc{geowrite-21-case,
  title = {{geoWrite 2.1: source that rebuilds the original binaries}},
  howpublished = {\url{https://github.com/mist64/geowrite}},
  url = {https://github.com/mist64/geowrite},
  urldate = {2026-11-04},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/geowrite-21-case/}}
}

Plain text

geoWrite 2.1: source that rebuilds the original binaries. https://github.com/mist64/geowrite (accessed 2026-11-04). Awesome REA entry: https://awesomerea.org/resources/geowrite-21-case/

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Primary sources

README.md GitHub · mist64/geowrite · Revision 640f1ab
Makefile GitHub · mist64/geowrite · Revision 640f1ab
orig GitHub · mist64/geowrite · Revision 640f1ab