GEOS (Graphic Environment Operating System) is an operating system from Berkeley Softworks (later GeoWorks). Originally designed for the Commodore 64 and released in 1986, it provided a graphical user interface for this popular 8-bit computer. GEOS closely resembled early versions of Mac OS and included a graphical word processor (geoWrite) and paint program (geoPaint).A December 1987 survey by the Commodore-dedicated magazine Compute!'s Gazette found that nearly half of its readers used GEOS.