GEOS (Graphic Environment Operating System) was released back in the late 1980's for the Commodore 64 and 128 machines and provided it's users with a rather impressive GUI similar in appearance to early Mac OS. Capable of running on a 64KB, 1Mhz 8-Bit machine and complete with a comprehensive suite of applications (including an art package, word processor, spreadsheet and even a desktop publisher) GEOS is a technical marvel and further testiment to the old adage "if there's one thing a C64 can't do, it's nothing".
