| http://www.w3.org/ns/prov#value | - The portable display unit 32 also includes an electronics module (not shown), which includes a central processing unit (CPU), memory units such as Read-Only Memory (ROM), Random Access Memory (RAM) and non-volatile Random Access Memory (NVRAM), an internal modem, the LCD driver, a charge circuit and a clock, and optionally, a pen and digitizer screen overlaid on the display screen 60.
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