GEOS (Graphic Environment Operating System) was a graphical user interface (GUI) operating system developed by Berkeley Softworks (later GeoWorks) in the 1986 for the Commodore 64 and Commodore 128 8-bit computers.
Released in 1986, it transformed the Commodore 64 into productivity powerhouses by introducing a desktop and mouse-driven interface years ahead of similar features in mainstream PCs, resembling early versions of Mac OS.
GEOS was not a full multitasking OS but provided a non-preemptive environment where applications could share data via cut/copy/paste, and it used floppy disks as virtual memory for enhanced performance.
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