Created: 21 October 2026

In 1996, Sharp updated its Zaurus K-PDA with the ZR-5700 and ZR-5800. Retaining the compact clamshell design, miniature QWERTY keyboard and pen-based touchscreen of the ZR-5000, the new models focused on improving the software and making the device more useful for everyday work.

Both models feature a 4-inch monochrome LCD touchscreen with a resolution of 320 × 240 pixels, powered by a 16-bit processor running at 9 MHz. They run Sharp's Synergy operating system and include applications for managing appointments and contacts, taking notes, organising documents and communicating with other devices. The built-in spreadsheet application, PenCell, adds more serious number-crunching capabilities, while the PC Card slot allows the system to be expanded with compatible peripherals. An infrared port and serial connectivity support data exchange and synchronisation with a PC.

The main difference between the two models is their memory and display. The ZR-5700 has 1 MB of RAM and a non-backlit display, whereas the ZR-5800 doubles the memory to 2 MB and adds a backlight, making it easier to use in dim surroundings. The additional memory also provides more room for applications and user data.

Both models support a range of optional accessories to expand their capabilities, including external fax/modems, PC Card modems, SRAM and Flash memory cards, infrared adapters, serial connection cables, level converters, an AC adapter and an external battery pack. Compatible printers can also be connected for printing documents and data.