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The MID Profile

As mentioned earlier, a configuration (such as the CLDC) is supposed to define a "baseline" for specific profiles. A profile is designed to supply a runtime environment for a specific type of device. The first profile unleashed on the wireless world is the Mobile Information Device Profile, or MIDP, as it's commonly called.

A little trivia: Just as a Java program loaded into a browser was called an applet, Java programs loaded onto a MID profile are known as midlets.

The MID profile is designed for a device that should support the following hardware:

  • Display: 96x54 pixel size, 1-bit display depth, aspect ratio 1:1

  • Input: One or more of the following: one-handed keyboard, two-handed keyboard, touch screen

  • Memory: 128KB non-volatile memory for the MIDP components; 8KB non-volatile memory for application-created persistent data; 32KB volatile memory for the Java runtime

  • Networking: Two-way, wireless, possibly intermittent, with limited bandwidth

A MIDP-class device should also support the following software features:

  • Minimum kernel to manage the underlying hardware

  • Mechanism to read and write from non-volatile memory

  • Read and write access to the device's wireless networking

  • Mechanism to provide a time base for use in time-stamping

  • Minimal capacity to write to a bitmapped graphics display

  • Mechanism to capture user input from one or more input mechanisms (see the earlier hardware input requirements)

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