HP 200Lx
The HP 200Lx is a personal digital assistant introduced by Hewlett-Packard in 1994. It was one of very few palmtops ever developed that was 100%[1] DOS compatible. Input was entered via a very small QWERTY-keyboard, enclosed in a clamshell-style case, about 25% of the size of a standard notebook computer. The 200Lx has an Intel 80186 CPU which runs at ~ 7.91 megahertz (which could be upgraded or overclocked to up to 15.8 MHz) and 640KB of RAM. Being PC compatible and running MS-DOS 5.0, it could run virtually any program that would run on a full-size PC compatible computer as long as the code was written for the Intel 8086, 8088 or 80186 CPU. During the mid 1990s there was a magazine called the Palmtop Paper [1] which was published 6 times per year that documented tips and tricks for using the Lx palmtop. Although this product was discontinued by HP in order to introduce their Windows CE product line (beginning with the 300Lx), a strong interest in this hardware continues today as it is the last palmtop from HP which ran DOS and thus HP no longer actively advertises the product. - There are notible exceptions to the device being "100% compatible":
::* The HP 100/200lx do not have a Digital-to-analog converter and cannot make different tones. It is instead used to monitor battery charging.
::* The device does not provide the BIOS service (INT13) for reading from a hard disk. Drivers have been partially written (to boot MINIX).[1]
Further Reading
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