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| 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.