THEOS
| Developer | Phase One Systems / Timothy S. Williams / THEOS Software Corporation | 
|---|---|
| Initial release | 1977 | 
| Latest release | THEOS Corona Commercial Release 6 / December 2008 | 
| Available in | English | 
| Platforms | Zilog Z80, IBM Personal Computer/AT | 
| License | proprietary | 
| Official website | www | 
THEOS, which translates from Greek as "God", is an operating system which started out as OASIS, a microcomputer operating system for small computers that use the Z80 processor. When the operating system was launched for the IBM Personal Computer/AT in 1982, the decision was taken to change the name from OASIS to THEOS, short for THE Operating System.