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   OASIS operating system
   The OASIS operating system (renamed THEOS in about 1983) was originally developed and distributed in 1977 by Phase One Systems of Oakland, California (President Howard Sidorsky). OASIS was developed for the Z80 processor and was the first multi-user operating system for 8 bit microprocessor based c...
   Found op http://en.wikipedia.org/wiki/OASIS_operating_system
   
   

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