The HP 95LX (also known as Project Jaguar) was the first MS-DOS pocket computer or personal digital assistant, introduced by Hewlett-Packard in 1991.
The HP 95LX has an NEC V20 CPU (an Intel 8088 clone) and can not be considered completely PC-compatible because of its quarter-CGA resolution LCD screen. It runs Microsoft's MS-DOS version 3.22 and has Lotus 1-2-3 built in. Other software in read-only memory (ROM) included a calculator, an appointment calendar, a telecommunications program, and a simple text editor. It also includes a CR 2025 lithium coin cell for memory backup when the two AA main batteries run out. For mass storage the HP95LX had a single PCMCIA slot which could hold a static RAM card (which had its own back-up coin cell). An RS-232 compatible serial port was provided, as well as an infrared port for printing on compatible models of Hewlett Packard printers. In character mode the display shows 16 lines of 40 characters and is not back-lit.