Parts of this article have been copied from Wikipedia's page about GEOS.
GEOS is an acronym that stands for Graphic Environment Operating System. It was originally developed by Berkeley Softworks (later renamed to GeoWorks), and the first version was released to consumers in 1986.
Official versions (contains info from C64 wiki) :
| GEOS Version | Release year | Notes |
|---|---|---|
| 1.0 | 1985 | Beta version for developers |
| 1.1 | 1985 | Beta version for developers |
| 1.2 | Jan. 1986 | First version available for consumers |
| 1.3 | June 1986 | First version for other languages |
| 1.5 | 1987/88 | GEOS version that got bundled with the C64C |
| 2.0 | June 1988 | GEOS 2.0 is presented in the CES in Las Vegas |
Unofficial community-created versions
| GEOS Version | Release year | Notes |
|---|---|---|
| 2.5 | 1993 | German publisher Mark & Technik developed this version in collaboration with “GUC - GEOS User Club” |
| MegaPatch3 | 1999 | Patched version of GEOS to work with 4 drives, CMD devices, and more. |
| GDOS64 | January 6, 2022 | GEOS compatible, standalone project. Has many features from MegaPAtch3, but is a separate project. Active project |