The HP 200LX is an MSDOS Palmtop PC from the early 90's.

This tutorial will show you how to safely disassemble and reassemble the bottom shell of your HP 100 or 200LX system to gain access to the motherboard for repairs and upgrades.

The HP 200LX palmtop is an IBM PC/XT compatible MSDOS system with a 16bit 80186 CPU and CGA graphics systemonachip, a serial port and a 16bit PCMCIA expansion slot containing a 2GB CompactFlash card for main storage.

If you have any technical questions, or are interested in obtaining upgrades such as doublespeed crystals and/or memory upgrade headers and boards, please contact me in the comments and I can help you obtain what you need.