REX 6000
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The Rex 6000 is an ultra-thin PDA produced by Xircom, then Intel, from about 2000 to 2001. Its primary claim to fame is as “The world's smallest full-function PDA”: due to its unusual physical configuration as a PCMCIA Type-II card (8.57 x 5.40 x .5 cm; 40 g), it may be synchronized by inserting it in a host PC's PCMCIA/PC-card slot. (Docking stations were manufactured for connection to hosts without PCMCIA Type-II slots.)
The Rex 6000 is the successor to the Franklin REX 5000, with a notable difference being the addition of a touch screen; additionally, it is possible to remove and install executable code (including both custom applications and the operating system itself). As with the earlier Reges, the Rex 6000 was initially developed by the Citizen Watch Company of Japan, marketed as the "DataSlim-2."
The earliest release of the Rex 6000 had 1 MB of flash memory; later releases doubled this to 2 MB. (Earlier Reges had used RAM with the operating system in ROM.) It uses a 4.3 MHz Toshiba microprocessor emulating the Zilog Z80, has a 240 by 120 pixel monochrome LCD, and is powered by two button-type lithium cells.
As of 2005, the Rex 6000 retains a devoted group of users and developers.