Delta OS

Delta OS is Pearler OS system based on Windows, Linux and Mac OS.

1982-1999 Original versions
1982-1986 Delta DOS-OS

1987-1992 Delta OS V1

1993-1997 Delta OS V2

1997-1999 Delta OS V3

1999-2000(Delta OS V 3.1)

2001 Delta OS V3.11

2002 Delta OS V 3.2

2006 Delta OS V 3.5

2007 Delta OS V 3.51

2009 Delta OS 3.9

2011 (Version 5: Codename Berlin)
Mid 2011 Version 5.5 Codename: Redstone

2016-2017 (Version 7: Codename Hatsune Miku)
The development of version 7 starts on September 7 2015. Originally, it was going to be codenamed: Tom and Jerry, then changed to France. The codename: Hatsune Miku features all of the Tablet, Deltaphone,Delta Disc, Delta Console and smart TV version. The release will be 28 Feburary 2018