Palm OS
Palm m505, running Palm OS 4.0
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| Developer | Palm, Inc., ACCESS (Garnet OS) |
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| Written in | C++ |
| OS family | Palm OS |
| Working state | Discontinued since 2009 |
| Source model | Activesource |
| Initial release | 1996 |
| Latest release | Garnet OS 5.4.9 / October 14, 2007 |
| Available in | English, French, Japanese and more |
| Platforms | ARM architecture |
| License | Proprietary EULA |
| Official website | Garnet OS |
Palm OS (also known as Garnet OS) is a discontinued mobile operating system initially developed by Palm, Inc., for personal digital assistants (PDAs) in 1996. Palm OS was designed for ease of use with a touchscreen-based graphical user interface. It is provided with a suite of basic applications for personal information management. Later versions of the OS have been extended to support smartphones. Several other licensees have manufactured devices powered by Palm OS.
Following Palm's purchase of the Palm trademark, the currently licensed version from ACCESS was renamed Garnet OS. In 2007, ACCESS introduced the successor to Garnet OS, called Access Linux Platform and in 2009, the main licensee of Palm OS, Palm, Inc., switched from Palm OS to webOS for their forthcoming devices.
Palm OS was originally developed under the direction of Jeff Hawkins at Palm Computing, Inc. Palm was later acquired by U.S. Robotics Corp., which in turn was later bought by 3Com, which made the Palm subsidiary an independent publicly traded company on March 2, 2000.
In January 2002, Palm set up a wholly owned subsidiary to develop and license Palm OS, which was named PalmSource. PalmSource was then spun off from Palm as an independent company on October 28, 2003. Palm (then called palmOne) became a regular licensee of Palm OS, no longer in control of the operating system.
In September 2005, PalmSource announced that it was being acquired by ACCESS.
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