Pocket MS-DOS

Pocket MS-DOS was an MS-DOS version for phones and handheld computers. The first version was launched in 1982.

Versions
Newer versions of Pocket MS-DOS mainly keep up with the desktop version, for example, 5.0 of MS-DOS for PCs was released at the same time as Pocket MS-DOS 5.0, there are a few deviations though (Like Pocket MS-DOS 6.22 releasing in 1996 when the desktop version released 2 years earlier.), and there is one major expection of Pocket MS-DOS 3.0 being skipped for unknown reasons, with the version number jumping straight to 4.0 by the time Desktop MS-DOS 3.0 launched, resulting in desktop MS-DOS to have to catch up to 4.0 by 1987 when Desktop MS-DOS 4.0 properly launched.