Navigation control - Introduction

Navigation control
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Description
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On/off
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Turns Pocket PC 2002 on and off
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Action button
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Acts as the ENTER key
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Record button
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Activates the Voice Recorder application
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Program button(s)
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Launches an application
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Up
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Acts as an UP ARROW key
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Down
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Acts as a DOWN ARROW key
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Some OEMs may add a silkscreen region, which is an extension of the resistive touch panel, to cover a non-LCD region of a Pocket PC 2002 case. This region is usually directly below the LCD. It is called a silkscreen region because it often has buttons applied by using a silkscreen process. While a silkscreen button is technically a software control, Pocket PC 2002 software does not distinguish between a silkscreen button and other navigation controls; both types of buttons send the same virtual key messages. The OEM is responsible for the driver that handles the silkscreen region.
Depending on the device category, some Pocket PC 2002 devices will not support audio input or playback.
For devices that support audio, a built-in microphone is included. It is usually located on the front of the device, so that a user can view the screen while recording. The hardware supports 16-bit sampling at 8 kHz, and codec, the compression and decompression software, compresses the recording to 2.4 Kbps. The codec software is identical to a desktop computer's audio compression manager (ACM). OEMs may add a microphone jack for an external microphone. The jack is transparent to the software.
The developer can use the built-in speakers to play sounds associated with notification events. Speakers can also be used to play voice recordings or other .wav files, or for dual tone multifrequency (DTMF) dialing output. Some OEMs may add a headphone jack for headphones, external speakers, or other audio-out hardware. This jack is transparent to the software.
Printing is not currently supported on the Pocket PC 2002.
An OEM may provide several notification options for a Pocket PC 2002: audio, a flashing LED, or vibration controls such as those on cellular phones and pagers. Although all three of these methods are supported by Pocket PC 2002, all except audio notification are OEM options.
Because a Pocket PC 2002 is portable, battery life is very important. Pocket PC 2002 can run many hours on its standard battery source, and also has a backup battery to avoid data loss if the primary battery loses power.
Pocket PC 2002 uses the ARM family of CPUs. The ARM processors offer an excellent combination of high performance and low power consumption.
All Pocket PC 2002 devices come with at least 24 megabytes (MB) of ROM and 16 MB of RAM. The upgrade edition offered by some OEMs for their Windows Powered Pocket PC devices is tailored to fit in the 16 MB of Flash RAM available on those upgradeable devices.
Because it is important to conserve memory on a Pocket PC 2002, many Pocket PC 2002 operating system (OS) components are compressed in ROM. When a user needs a component, the operating system decompresses that component and transfers it to RAM. Because of the time required for decompression and transfer, compressed files slow performance.
Pocket PC 2002 comes with a built-in 16550 (or equivalent) serial port and some OEMs may include a second serial port. Applications use the serial port for communication between a Pocket PC 2002 and other hardware devices at baud rates from 19.2 kilobits per second (Kbps) to 115.2 Kbps. A Pocket PC 2002 can connect to a desktop computer by using a serial cable or an optional docking cradle, available from many Pocket PC 2002 manufacturers, that is connected to the desktop computer. Some Pocket PC 2002 devices support data communications through a modem connected to the cradle.
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Infrared communications serial port
Pocket PC 2002 includes a serial port that conforms to Infrared Data Association (IrDA) specifications. Pocket PC 2002 devices can communicate with other Pocket PC 2002 devices, other Windows CE devices, Palm™ OS-based handheld computing devices, or desktop computers.
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