Decade OS

Decade OS is never released operating system, created by Arsen54800. Released first version in 1980, new version every 10 years (1 decade).
== Versions ==
* Decade OS 1.0 (1980)
* Decade OS 2.0 (1990)
* Decade OS 3.0 (2000)
* Decade OS 4.0 (2010)
* Decade OS 5.0 (2020)
Category:Fictional OS