Abstract: An apparatus and method for updating a display are disclosed. Identifying values are determined for units of display data. Identifying values for units of display data received during an update are compared to identifying values for previously received units of display data. Depending on the comparison, the update of the corresponding portion of the display may be skipped.

Abstract: A wallet for a personal information device in the form of a PCMCIA card such as an PCMCIA-card electronic organizer. The wallet includes an input device separate from the input device of the personal information device and two halves that may be folded together in a wallet-like fashion. One of the halves generally includes a touch panel input to allow a user to enter information, commands, instructions, etc., thereto. A personal information device is mounted to the second half of the wallet. When mounted, the wallet supplies via an electrical connection or induction communication the user-supplied information entered into the touch panel input to the personal information device. The wallet display may be powered by the personal information device via the electrical connection or self-powered. Upon coupling the personal information device to the wallet, the personal information device may supply a wake signal to wake up or automatically turn on the input device of the wallet.

Abstract: A wallet for a personal information device in the form of a PCMCIA card such as an PCMCIA-card electronic organizer. The wallet includes an input device separate from the input device of the personal information device and two halves that may be folded together in a wallet-like fashion. One of the halves generally includes a touch panel input to allow a user to enter information, commands, instructions, etc., thereto. A personal information device is mounted to the second half of the wallet. When mounted, the wallet supplies via an electrical connection or induction communication the user-supplied information entered into the touch panel input to the personal information device. The wallet display may be powered by the personal information device via the electrical connection or self-powered. Upon coupling the personal information device to the wallet, the personal information device may supply a wake signal to wake up or automatically turn on the input device of the wallet.

Abstract: A wallet for a personal information device in the form of a PCMCIA card such as an PCMCIA-card electronic organizer. The wallet includes an input device separate from the input device of the personal information device and two halves that may be folded together in a wallet-like fashion. One of the halves generally includes a touch panel input to allow a user to enter information, commands, instructions, etc., thereto. A personal information device is mounted to the second half of the wallet. When mounted, the wallet supplies via an electrical connection or induction communication the user-supplied information entered into the touch panel input to the personal information device. The wallet display may be powered by the personal information device via the electrical connection or self-powered. Upon coupling the personal information device to the wallet, the personal information device may supply a wake signal to wake up or automatically turn on the input device of the wallet.

Abstract: A hand held electronic data processing device has an input keyboard and a display screen. A sixteen bit central processing unit (CPU) address bus addresses read only memory (ROM) and random access memory (RAM). However, a twenty bit register provides a twenty line address bus that is employed for addressing sequential data in ROM. A direct memory access (DMA) unit provides direct transfer of data from RAM to a forty bit register which controls the state of the pixels in a 240 character liquid crystal display (LCD). The keyboard is connected in an electronic matrix with rows driven by signals applied by system address bus lines. These various functions require exclusive use of the system address bus.