New software can take advantage of the ARM processors with PNO (PACE Native objects), small units of ARM code. Even with the additional overhead of PACE, Palm applications usually run faster on ARM devices than on previous generation hardware. Described as a stepping stone to full ARM support, Palm apps are run in an emulated environment called the Palm Application Compatibility Environment (PACE), allowing great compatibility with old programs. Version 5.0 was introduced with the Tungsten T and was the first version released to support ARM devices. This added a standard interface for external FS access (such as SD cards) and improved telephony libraries, security and UI improvements. Version 4.0 was released with the m500 series, and later made available as an upgrade for older devices. Programs on a Palm OS handheld can also be displayed as a list.
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