The HP 200LX Palmtop PC (F1060A, F1061A, F1216A), also known as project Felix, is a personal digital assistant introduced by Hewlett-Packard in August 1994.

[3] Input is accomplished via a small QWERTY-keyboard with a numeric keypad, enclosed in a clamshell-style case, less than about 25% of the size of a standard notebook computer.

The HP 200LX has an Intel 80186 compatible embedded central processing unit named "Hornet", which runs at ~7.91 megahertz (which can be upgraded or overclocked to up to 15.8 MHz) and 1, 2 or 4 MB of memory, of which 640 KB is RAM and the rest can be used for expanded memory (EMS) or memory-based storage space.

After-market updates can bring the memory chips to up to 64 MB, which frees the PCMCIA slot for modem or Ethernet card use.

With a large CompactFlash storage card and a serial mouse, Microsoft Windows 3.0 can be run on the palmtop.

An electroluminescent back light installation is available from a third party since 2004, but keen eyesight is still required to use the small palmtop effectively without resorting to using its 2× and 4× zoom modes.

It was announced in late 1995 as part of plans for a collaboration between HP and Nokia,[14] with shipment started in March 1996.

The HP 95LX Palmtop PC (F1000A for the 512 KB, F1010A for the 1 MB model) introduced the basic design in April 1991.

The HP OmniGo 100 Organizer Plus (F1305A/F1310A) was designed as a more sophisticated successor to the LX series, and incorporated the HP-12C calculator functionality.

The normal operation mode was with DOS-based PEN/GEOS 2.1 and Graffiti handwriting recognition running on Datalight ROM-DOS 6.22.

Equipped with 1 MB of RAM, it was based on the Vadem VG230/V5H,[17] a highly integrated system controller with 16 MHz NEC V30HL CPU, instruction set compatible with the Intel 80186.

[18][19][20] Because of its small size, the HP 200LX was very popular in Japan, so much so that its demise prompted an open-source initiative led by a group named Morphy One [ja] to design and market an AMD Élan SC400-based replacement to fill its place in 2001.

The project leaders argued that key electronic components were unavailable due to strong demand from the mobile phone manufacturing industry.

With the palmtop powered off, the user may press ESC+ON to start the self test mode, then cursor down to the display option.

With the palmtop powered off, the user may press ESC+ON to start the self test mode, then cursor down to the display option.

The poem is as follows: Felis Concolor A funny thing happened on the way to the Forum When I encountered a group in search of a quorum.

With the palmtop powered off, the user may press ESC+ON to start the self test mode, then cursor down to the display option.

The HP 200LX includes an undocumented calculator application named HEXCALC, written by Andrew Gryc.