View source for HP 200LX

{{short description|Personal digital assistant manufactured by Hewlett-Packard}}
{{Weasel|date=November 2023}}
{{Use dmy dates|date=April 2019|cs1-dates=y}}
{{Use list-defined references|date=November 2023}}
{{Infobox information appliance
| name         = Hewlett-Packard 200LX
| title        = 
| aka          = 
| logo         = 
| image        = Hewlett Packard 200LX.jpg
| caption      = Case open
| developer    = 
| manufacturer = [[Hewlett-Packard]]
| family       = 
| type         = [[Palmtop PC]]
| generation   = 
| releasedate  = {{Start date and age|August 1994|df=yes}}
| lifespan     = 
| price        = 
| discontinued = December 1999
| unitssold    = 
| unitsshipped = 
| media        = 
| os           = Hewlett-Packard [[MS-DOS 5.0]]
| power        = 2× AA-size removable batteries, 1× [[CR2032]] coin cell backup, optional AC adapter
| soc          = 
| cpu          = [[Intel 80186|80186]]-compatible "[[HP Hornet|Hornet]]" @ 7.91&nbsp;MHz
| memory       = 1/2/4&nbsp;MB RAM<!-- + ? ROM to be verified, -->
| storage      = 
| memory card  = SRAM, ATA Flash, Compact Flash. Up to 2&nbsp;GB using third-party driver.
| display      = 
| graphics     = CGA 640×200 (2 colors)<br />CGA 320x200 (4 colors)
| sound        = 
| input        = 
| controllers  = 
| camera       = 
| touchpad     = 
| connectivity = 
| platform     = 
| service      = 
| dimensions   = 16&nbsp;× 8.64&nbsp;× 2.54&nbsp;cm (6.3"&nbsp;× 3.4"&nbsp;× 1") 
| weight       = 
| topgame      = 
| compatibility= 
| predecessor  = HP 100LX
| successor    = [[HP 300LX]]
| related      = 
| website      = <!--{{URL|example.org}}-->
}}
[[Image:Hp200lx, closed.jpg|thumb|Case closed]]

The '''HP&nbsp;200LX Palmtop PC''' (F1060A, F1061A, F1216A), also known as '''Project Felix''', is a [[personal digital assistant]] introduced by [[Hewlett-Packard]] in August 1994.<ref name="Barr_1994"/><ref name="Hall_1994"/> It was often called a [[Palmtop PC]], and it was notable that it was, with some minor exceptions, a [[DOS]]-compatible computer in a palmtop format, complete with a monochrome graphic display, QWERTY keyboard, serial port, and [[PCMCIA card|PCMCIA]] expansion slot. The abbreviation "LX" stood for "Lotus Expandable".<ref name="HP_2012"/>

==Description==
{{Refimprove section|date=July 2023}} 
[[File:HP-200LX.jpg|thumb|Size comparison with 2009 Apple iPhone 3GS]]
[[File:Memory collection (cropped) HP F1003A 512kB.jpg|thumb|upright|512 kB SRAM PCMCIA memory card for HP 95LX, HP 100LX and HP 200LX]]
Input is accomplished via a small [[QWERTY]]-keyboard with a numeric keypad, enclosed in a [[Flip (form)|clamshell]]-style case, less than about 25% of the size of a standard [[notebook computer]]. The palmtop runs for about 30–40 hours on two [[AA battery|size AA]] alkaline or [[Ni-Cd]] rechargeable cells and can charge batteries (both Ni-Cd and NiMH) via a 12&nbsp;V DC wall adapter.

The HP&nbsp;200LX has an [[Intel 80186]] compatible embedded [[central processing unit]] named "Hornet", which runs at ~7.91 [[megahertz]] (which can be upgraded or [[overclocking|overclocked]] to up to 15.8&nbsp;MHz) and 1, 2 or 4&nbsp;[[Megabyte|MB]] of memory, of which 640&nbsp;[[kilobyte|KB]] is [[random access memory|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&nbsp;MB, which frees the PCMCIA slot for [[modem]] or [[Ethernet]] card use. The Silicom, Accton 2212/2216, Netgear FA411, and Sohoware ND5120 network cards were compatible. Being [[IBM Personal Computer|IBM PC]]/[[IBM Personal Computer XT|XT]] compatible and running [[MS-DOS 5.0]] from ROM, the HP&nbsp;200LX can run virtually any program that would run on a full-size PC compatible computer as long as the code is written for the [[Intel 8086]], [[Intel 8088|8088]] or [[Intel 80186|80186]] CPU and can run using CGA graphics. It can also run programs written for the 80286 CPU, provided they do not require the use of [[protected mode]]. It has a 16-bit [[PC card|PCMCIA]] Type II expansion slot that supports 5&nbsp;V at 150&nbsp;mA maximum, a [[Infrared Data Association|SIR]] compatible [[infrared port]] and a full [[serial port]] (but with a proprietary mini connector for space constraint reasons).

The built-in software suite runs from ROM and includes the [[Lotus 1-2-3 Release 2.4]] spreadsheet,<ref name="Lee_1993"/><ref name="Marshall_1993"/><ref name="HPPP"/> a calendar, a phone book, a terminal, [[Lotus cc:Mail]] and a scientific/business calculator (among other applications). With a large [[CompactFlash]] storage card and a serial [[Mouse (computing)|mouse]], [[Microsoft Windows 3.0]] can be run on the palmtop. Running Windows was limited by the hardware, and the maximum version that can be run is Windows 3.0 in Real Mode. However, Word 1.x and Excel 2.x for Windows will run (since they can run in Real Mode), allowing for the authoring of MS Office format-compatible files. The 640×200 resolution [[Color Graphics Adapter|CGA]] compatible 4-shade gray-scale LCD screen has no back light. 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.

While true CGA displays do not allow for redefinable fonts in text mode and support a [[hardware code page]] [[code page 437|437]], the [[#95LX|HP&nbsp;95LX]] supports [[code page 850]] instead.<ref name="HP_1991_95LXUG"/> Starting with the HP&nbsp;100LX, the LX series<!-- not the OmniGo 100/120 --> supports user-switchable text mode ROM fonts for both code page 437 and 850 as well as software-definable RAM fonts (for codepages [[code page 437G|437G]], [[code page 437T|437T]], 852, [[code page 866|866]] via KEYBEZ).<ref name="HP_1996_200LXUG"/> Lotus 1-2-3 internally uses the [[Lotus International Character Set]] (LICS), but characters are translated to code page 850 for display and printing purposes.

==Model variants==
==={{anchor|100LX|F1020A|F1022A}}HP 100LX===
The ''HP&nbsp;100LX Palmtop PC'' (F1020A for the 1&nbsp;MB, F1022A for the 2&nbsp;MB model),<ref name="Hall_1993"/> also known as project ''Cougar'', is the direct predecessor of the 200LX. It was released in 1993 and available in International English, U.S. English, French, German and Spanish variants with localized keyboard and messages.<ref name="Hall_1993"/> It is almost the same, including the Hornet CPU and [[MS-DOS 5.0]], but with earlier built-in application versions.

==={{anchor|FX}}HP Palmtop FX===
The ''HP Palmtop FX'' is a variant of the HP&nbsp;100LX<!-- one source claims 200LX? --> with up to 2&nbsp;MB flashable memory in 1993.<ref name="Schmuhl-Sherman-Waisnor_1996"/> [[FAT filesystem|FAT]] flash disk images could be created and written to drive F: by a special FLASHDSK.EXE utility.<ref name="Oilman_2008"/> According to one source, it was developed for a Korean insurance company.<ref name="HPmuseum"/>

==={{anchor|AIA}}HP 200LX AIA===
The ''HP&nbsp;200LX&nbsp;AIA'' is a 2&nbsp;MB double-speed variant of the HP&nbsp;200LX manufactured for the insurance company [[American International Assurance]] (AIA).<ref name="Auw_2012"/>

==={{anchor|1000CX|F1203A|F1222A}}HP 1000CX===
The ''HP&nbsp;1000CX Palmtop PC'' (F1203A for the 1&nbsp;MB in March 1995, F1222A for the 2&nbsp;MB model in February 1997), also known as project ''Puma'', is an economy version of the 200LX but without any built-in software except the MS-DOS&nbsp;5.0 operating system in ROM. It was in widespread use among, for example, [[Coca-Cola]] warehouse managers, who loaded their own logistics software onto the machine. It has a black clamshell, while the 200LX has a dark green casing.

==={{anchor|OG700LX|F1206A}}HP OmniGo 700LX===
The ''HP&nbsp;OmniGo&nbsp;700LX Communicator Plus'' (F1206A), codenamed ''Columbia'', was a project of the HP calculator branch in [[Singapore]]. The HP&nbsp;OmniGo&nbsp;700LX is a 2&nbsp;MB<!-- other sources state 1 MB? --> HP&nbsp;200LX redesigned to [[Piggy-back (transportation)|piggyback]] a [[Nokia 2110]] [[GSM]] [[mobile telephone]] for wireless mobility. The HP&nbsp;200LX motherboard was factory-modified to support a second PCMCIA slot for a Nokia Data Card. Owing to the relatively large size of the Nokia telephone, the HP&nbsp;OmniGo&nbsp;700LX has a large, pebble-shaped casing, making it a handheld with a phone attached. It was announced in late 1995 as part of plans for a collaboration between HP and [[Nokia]],<ref name="Hall_700LX"/> with shipment started in March 1996.<ref name="Hall_700LX"/> The production of the HP&nbsp;OmniGo&nbsp;700LX ceased after the Nokia 2110 mobile telephone was rendered obsolete by later telephones. The device can be seen as a forerunner to the first [[smartphone]], [[Nokia 9000 Communicator|Nokia's Communicator 9000]].

==Related models==
==={{anchor|95LX|F1000A|F1010A}}HP 95LX===
{{Main|HP 95LX}}
The ''HP&nbsp;95LX Palmtop PC'' (F1000A for the 512&nbsp;KB, F1010A for the 1&nbsp;MB model) introduced the basic design in April 1991. It was known internally as project ''Jaguar''. It has a [[NEC V20]] CPU (an enhanced [[Intel 8088]] clone with [[Intel 80186]] instruction set compatibility and an additional [[Intel 8080]] emulation mode) running at 5.37&nbsp;MHz, but is hampered in running PC applications because of its quarter-CGA resolution LCD screen and MDA-compatible (instead of CGA) graphics chip. The HP&nbsp;95LX for the most part only displayed graphics in a special LX graphics mode. It runs [[MS-DOS 3.22]] and has [[Lotus 1-2-3 Release 2.2]] built in.<ref name="Marshall_1991"/><ref name="Matzkin_1991"/> It also includes a CR2032 battery for memory backup when the AA batteries run out.

==={{anchor|OG100|F1305A|OG120|F1310A}}HP OmniGo 100===
[[File:HP OmniGo 100 (1).jpg|thumb|HP OmniGo 100]]
The ''HP&nbsp;OmniGo&nbsp;100 Organizer Plus'' (F1305A/F1310A) was designed as a more sophisticated successor to the LX series, and incorporated the [[HP-12C]] calculator functionality. It was GUI based, controlled by pen input or keyboard. However, it lacked the versatility of running unmodified DOS programs. The normal operation mode was with DOS-based [[PEN/GEOS]] 2.1 and [[Graffiti (Palm OS)|Graffiti]] handwriting recognition running on [[Datalight ROM-DOS 6.22]]. It was not widely accepted as a calculator replacement, and Palm and Pocket PCs became acceptable as PDAs. Equipped with 1&nbsp;MB of RAM, it was based on the [[Vadem VG230]]/V5H,<ref name="Goldstein"/> a highly integrated system controller with 16&nbsp;MHz [[NEC V30|NEC V30HL]] CPU, instruction set compatible with the [[Intel 80186]].

==Current usage==
Although this product line was discontinued by HP in order to introduce their [[Windows CE]] product line (starting with the [[HP 300LX]]), a strong interest in this hardware continued. It was the last palmtop from HP which ran the MS-DOS operating system, for which there is much software from desktop PCs, and it came with a useful bundle of software including 1-2-3 and [[Quicken]]. Compared to machines with Windows-based operating systems such as CE, DOS programs are more compact and efficient and, with programs such as [[Software Carousel]], many applications programs could be loaded at once.

Third-party upgrades, repairs and renovations are available to maintain and extend the device.<ref name="Hermocon"/><ref name="Repair"/><ref name="Bel"/>

Because of its small size, the HP&nbsp;200LX was very popular in Japan, so much so that its demise prompted an open-source initiative led by a group named {{ill|Morphy One|ja}} to design and market an [[AMD Élan]] SC400-based replacement to fill its place in 2001.<ref name="Tamiya_2000"/> However, only one prototype was ever built<ref name="Mynavi_2001"/> before the company responsible for the project filed for bankruptcy in 2003. Some argue it was a [[scam]] as hundreds of people lost deposits they placed on the new palmtop in advance. The project leaders argued that key electronic components were unavailable due to strong demand from the mobile phone manufacturing industry.<ref name="ASCII_2002"/>

==Common problems==
* A common problem with the HP&nbsp;200LX case is related to the injected-molded case top. The right hinge to case blend had poor flow in the process, resulting in the formation of a crack which propagates across the hinge under stress, causing failure. This can be reinforced and repaired using [[super glue]], among other methods (industrial super glue advised). One can also use a small thin rectangular piece of metal and epoxy it to the upper right hand corner of the clam shell where the crack occurs. This offers additional support to the area and prevents and/or repairs this problem.
* Another weakness of the design is the failure of the case opening latch. This problem can easily be repaired by placing a thin slice cut from rubber eraser, left over silicone kit, or 'super sponge' within the latch as a "spring".
* Only high quality AA rechargeable batteries should be used in the HP&nbsp;200LX, as battery leaks can destroy the LCD's flat video cable.
* Aging models may lose pixel columns from the display. This is caused by detachment of one or more pins of one of the SMD (Surface Mounted Device) chips in the display itself. In many cases this may be repaired by reflowing (resoldering) of the pins on the offending chip, either with an SMD reflow tool, or a soldering iron with a very fine (0.2&nbsp;mm) tip.
* Under heavy use, the space bar and enter bar can become detached. This requires keyboard replacement.
* Under heavy use from opening and closing, the long flex strip connector between the screen and the motherboard can become torn as it tends to rub against internal components in the housing. Typically, the only way to fix this once torn is to replace the flex strip.
* ''Fixing unresponsive keyboard keys''. Inside the HP&nbsp;200LX, the keyboard connects to the main board via a "ribbon" that has graphite pads which make physical contact to gold pads plated onto the main board. Unresponsive keys occur when this connection grows weak. This can be fixed by applying conductive silver paint (such as from a circuitwriter pen) to each graphite pad on the "ribbon". One can also use copper tape cut out to small circles. This tape adheres nicely to the graphite pad and actually gives a more definitive long lasting connection than silver paint, although both work fine. This is delicate work, and putting the HP&nbsp;200LX back together after disassembly may be problematic for those who have little experience with electronics repair. However, the conductive silver paint will fully fix the problem if applied with care. An alternate cause can be corrosion of the motherboard pads to which the graphite pad connects. This can be solved by polishing the pads with fine steel wool.

==Exceptions to 100% IBM PC compatibility==
* The HP&nbsp;100LX/HP&nbsp;200LX's [[digital-to-analog converter]] cannot play audio tones; instead, it monitors battery life and charging{{fact|date=October 2023}}.
* The device does not provide the [[BIOS]] service ([[INT 13h]]) for reading from a [[hard disk]]. [[Device driver|Drivers]] have been partially written for this purpose (to boot [[MINIX 2.0]]).<ref name="Minix"/>

==Other notes==
* The HP&nbsp;200LX was used on board the NASA Discovery OV103 Mission [[STS-95]] (the last mission of Senator [[John Glenn]]) in an [[Electronic nose|Electronic Nose]] (E-Nose) experiment (the device was developed jointly by Jet Propulsion Laboratory ([[JPL]]) and the California Institute of Technology ([[Caltech]])). The experiment, as managed by Dan Karmon of JPL, was successful.
* The HP&nbsp;200LX can play video, and sound files using software from Stefan Peichl in relatively low quality. It is also capable of sound recording, though this is, again, in relatively low quality. There is no known compatible PCMCIA sound card for the HP&nbsp;200LX. However, a Yamaha MU10 MIDI sound generator (a.o.) works through the serial port using Voyetra or GSPlay MIDI programs, and Terrence Vergauwen uses a PCMCIA parallel port card plus an OPL3LPT (Adlib compatible sounds card thru parallel port) for gaming.  
* Software and hardware is available which will allow the HP&nbsp;200LX to surf the [[Internet]].
*The serial numbers printed on the HP machines 100LX, 200LX, 1000CX and OmniGo 700LX have the following meaning:
: {|
|-
| colspan="2" | ''XXYWWNNNNN'' 
|-
| ''XX'' || = the country of manufacturing (e.g., SG = Singapore etc)
|-
| ''Y'' || = the year of manufacturing; last digit (e.g., 6 = 1996)
|-
| ''WW'' || = the week of the year of manufacturing
|-
| ''NNNNN'' || = the number of the specific unit manufactured in specified week
|}

==Easter eggs==
There are many [[Easter egg (virtual)|easter eggs]] built into the HP&nbsp;200LX. The known ones are listed as follows:

===Hidden gallery===
This easter egg is on the HP&nbsp;200LX in the built in game, "Lair of Squid". During the startup screen of the game, if the user types the word "gallery" ("gallerie" on a French palmtop; "siegergalerie" on a German palmtop; "galeria" on a Spanish palmtop) they are placed in a "part" of the maze that contains photographs of the primary software developers that worked on the HP&nbsp;200LX.<ref>{{Cite web |last=Edwards |first=Benj |date=2024-07-09 |title=Why 1994’s Lair of Squid was the weirdest pack-in game of all time |url=https://arstechnica.com/gaming/2024/07/how-i-found-a-forgotten-squid-based-ode-to-doom-on-a-1994-palmtop-pc/ |access-date=2025-11-24 |website=Ars Technica |language=en}}</ref> The user may exit from this gallery by exiting through the door at the end of the corridor. The software developers in the photographs are listed starting from left to right, then left to right and so on as follows:

* Andy Gryc
* Pat Megowan
* Everett Kaser
* Bill Johnson
* Lynn Winter
* Susan Wechsler
* Eric Evett

The last panel on the right of the corridor contains a thank you message:

{{cquote|Very special thanks to all the people in HP and all the companies that made this palm-top possible. The Felix S/W team}}

The photographs of the developers have been described as "a-maze-ing".{{Citation needed|reason=If this is a personal opinion, it doesn't belong on Wikipedia, although it is funny! If it has been said by a notable source, please add a reference.|date=August 2014}}

===Self-test poem 1===
This easter egg is in the HP&nbsp;200LX self test mode. With the palmtop powered off, the user may press {{keypress|ESC|ON}} to start the self test mode, then cursor down to the display option. On pressing {{keypress|ENTER}} 14 times, to step through the various screens, the user comes to a screen of example text in the form of a [[Limerick (poetry)|limerick]] poem. The poem is as follows:

{{cquote|There once was this thing from HP
That fit in your pocket, you see.<br />
A caveman would stare<br />
And pull out his hair<br />
And wonder, 'What could this thing be?'
}}

===Self-test poem 2===
This easter egg is in the HP&nbsp;200LX self test mode. With the palmtop powered off, the user may press {{keypress|ESC|ON}} to start the self test mode, then cursor down to the display option. On pressing {{keypress|CTRL|ENTER}}, then holding down {{keypress|ALT}} while pressing {{keypress|ENTER}} 13 times, the user comes to a cryptic poem, relating to business issues faced by the software development team. The poem is as follows:

{{cquote|Felis Concolor
[[A funny thing happened on the way to the Forum]]<br />
When I encountered a group in search of a quorum.<br />
They came from a city, The Burg On The Wire.<br />
If I tried to describe it you'd call me a liar.<br />
They wanted to charge me a really quite large fee<br />
For the dubious pleasure of sharing their treasure.<br />
"I'm a very Good man (Mark my words if you can),"<br />
"But, the Dickens, I say, I simply won't pay!"<br />
And with poetry, then, I proceeded to bore 'em<br />
Then proceeded myself on my way to the Forum.}}

===Self-test poem 3===
This easter egg is in the HP&nbsp;200LX self test mode. With the palmtop powered off, the user may press {{keypress|ESC|ON}} to start the self test mode, then cursor down to the display option. On pressing {{keypress|CTRL|ENTER}}, then holding down {{keypress|SHIFT}} while pressing {{keypress|ENTER}} 13 times, the user comes to an allegorical poem about the history and future of the HP LX palmtops. The poem is as follows (note that the project names for the HP&nbsp;95LX, the HP&nbsp;100LX and the HP&nbsp;200LX are 'Jaguar', 'Cougar' and 'Felix' respectively, and that 'Felix' was the first LX to include [[Quicken]]):

{{cquote|Nine lives has a Cat, and each Cat a name,
All of them different, none are the same.<br />
Jaguar was first, it made quite a roar.<br />
Cougar was next, oh, how it did soar.<br />
Felix is third, my heart it does quicken,<br />
Who knows what comes next, the clock is a tickin'.}}

=== Hidden development aid in 'More Applications' ===
This easter egg is in the built in [[System Manager (HP LX)|System Manager]] of the HP&nbsp;200LX. This 'easter egg' is probably more of a development tool than an easter egg, but, in any case, the user may display the function by first pressing the blue {{keypress|&...}} key to start 'More Applications'. The user may then hold down {{keypress|ALT}} while pressing {{keypress|F9}} four times, followed by {{keypress|F10}} once. As long as the {{keypress|ALT}} key is held down, the user will observe columns of data about System Manager compliant (.EXM) programs registered with the System Manager, along with other arcane program information.

==={{anchor|HEXCALC}}Hidden hex calculator===
The HP&nbsp;200LX includes an undocumented calculator application named HEXCALC, written by Andrew Gryc. It provides arithmetical and logical operations in binary, octal, decimal and hexadecimal system. The utility can be added to the applications menu by an entry with the following fields:

* Name: He&x Calc
* Path: D:\BIN\HEXCALC.EXM

==See also==
* [[HP&nbsp;110]] / [[HP&nbsp;110 Plus]]
* [[DIP Pocket PC]] / [[Atari PC Folio]] / [[Atari Portfolio]]
* [[Poqet PC]]
* [[Poqet PC Prime]]
* [[Poqet PC Plus]]
* [[ZEOS Pocket PC]]
* [[Ben NanoNote]]
* [[Sub-notebook]] ([[HP OmniBook]])
* [[Netbook]]
* [[Palmtop PC]]
* [[Ultra-mobile PC]]

==References==
<references>
<ref name="Barr_1994">{{cite magazine |title=HP 200LX Quickens Your Expense Account |author-first=Christopher |author-last=Barr |magazine=[[PC Magazine]] |date=1994-11-08 |volume=13 |issue=19 |page=56 |url=https://books.google.com/books?id=r-5Zq-uW-N8C&pg=PA56}}</ref>
<ref name="Hall_1994">{{cite journal |title=NEWS: HP's New 200LX Palmtop PC Replaces the 100LX and Features Intuit's Pocket Quicken |author-first=Rich |author-last=Hall |date=1994 |journal=[[The HP Palmtop Paper]] |publisher=[[Thaddeus Computing]] |url=https://www.palmtoppaper.com/PTPHTML/16/pt160007.htm |access-date=2017-04-30 |url-status=live |archive-url=https://web.archive.org/web/20170430222012/http://www.palmtoppaper.com/PTPHTML/16/pt160007.htm |archive-date=2017-04-30}}</ref>
<ref name="Lee_1993">{{cite magazine |title=HP 100LX rolled out as successor to palmtop |magazine=[[InfoWorld]] |author-first=Yvonne |author-last=Lee |date=1993-05-03 |volume=15 |issue=18 |page=27 |url=https://books.google.com/books?id=QjsEAAAAMBAJ&pg=PA27 |access-date=2016-11-26}}</ref>
<ref name="Marshall_1993">{{cite magazine |title=Hewlett-Packard makes a good thing better by packing 100LX with features |journal=[[InfoWorld]] |author-first=Patrick |author-last=Marshall |date=1993-08-23 |volume=15 |issue=34 |page=96 |url=https://books.google.com/books?id=rjsEAAAAMBAJ&pg=PA96 |access-date=2016-11-26}}</ref>
<ref name="HPPP">{{cite web |title=Questions and Answers about HP Palmtops: Q. What software is built into the 200LX ROM? |publisher=[[The HP Palmtop Paper Online]] |url=https://www.palmtoppaper.com/HP200.asp |access-date=2016-11-26 |url-status=live |archive-url=https://web.archive.org/web/20161127020428/http://www.palmtoppaper.com/HP200.asp |archive-date=2016-11-27}}</ref>
<ref name="HP_1991_95LXUG">{{cite book |title=HP 95LX User's Guide |publisher=[[Hewlett-Packard Company]], Corvallis Division |location=Corvallis, Oregon, USA |edition=2 |date=June 1991 |orig-date=March 1991 |id=F0001-90003 |url=https://www.retroisle.com/others/hp95lx/OriginalDocs/95LX_UsersGuide_F1000-90001_826pages_Jun91.pdf |access-date=2016-11-27 |url-status=live |archive-url=https://web.archive.org/web/20161128202642/http://www.retroisle.com/others/hp95lx/OriginalDocs/95LX_UsersGuide_F1000-90001_826pages_Jun91.pdf |archive-date=2016-11-28 |pages=E-1 – E-3, F-1 – F-7 |quote=The [[HP&nbsp;95LX]] character set is equivalent to [[code page 850]], the [[IBM&nbsp;PC]] multilingual character set. (Note that your HP&nbsp;95LX contains [[MS-DOS 3.22]], which does not support [[code-page switching]].) All the HP&nbsp;95LX applications use this set except [[Lotus 1-2-3|1-2-3]], which uses [[LICS (character set)|LICS]], the [[Lotus International Character Set]]. Most LICS characters are included in code page 850; the few that are not will not display […] If your HP&nbsp;95LX cannot display […] or if your printer cannot print a LICS character, the HP&nbsp;95LX uses a fallback presentation for that character […] if you use the <code>©</code> symbol and your printer cannot print it, the HP&nbsp;95LX might display <code>(c)</code> or <code>c</code> as the fallback presentation (depending on the capabilities of your printer).}}</ref>
<ref name="HP_1996_200LXUG">{{cite book |title=HP 200LX User's Guide |publisher=[[Hewlett-Packard Singapore (Private) Limited]], Asia-Pacific Personal Computer Division |location=Singapore |edition=1 |date=October 1996 |id=1216-90001 |url=https://h10032.www1.hp.com/ctg/Manual/bpia5259.pdf |access-date=2016-11-29 |url-status=live |archive-url=https://web.archive.org/web/20161130124719/http://h10032.www1.hp.com/ctg/Manual/bpia5259.pdf |archive-date=2016-11-30 |pages=21-6 – 21-7, 25-9 – 25-13, 26-14 – 26-18, C-1 – C-4, D-1 – D-10 |quote=Your palmtop supports [[code page 850|code pages 850]] and [[code page 437|437]]. The built-in applications (except [[Lotus 1-2-3|1-2-3]]) and [[System Manager (HP LX)|System Manager]]-compliant applications […] use code page 850. 1-2-3 uses [[LICS (character set)|LICS]], the [[Lotus International Character Set]]. Most LICS characters are included in code page 850; the few that are not included will not display on the palmtop. […] Any DOS application you load and run will by default use code page 437. If an application requires code page 850, you can select it using the Setup utility.}}</ref>
<ref name="Hall_1993">{{cite journal |title=HP NEWS--HP News: New 2MB HP 100LX; Upgrade Path Available |author-first=Rich |author-last=Hall |date=1993 |publisher=[[Thaddeus Computing]] |journal=[[The HP Palmtop Paper Online]] |url=https://www.palmtoppaper.com/ptphtml/13/pt13000b.htm |access-date=2015-08-29}}</ref>
<ref name="Schmuhl-Sherman-Waisnor_1996">{{cite journal |url=https://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1996-06.pdf |journal=Hewlett-Packard Journal |date=June 1996 |volume=47 |issue=3 |title=HP PalmVue: A New Healthcare Information Product |pages=64–69 |author-first1=Edward H. |author-last1=Schmuhl |author-first2=Allan P. |author-last2=Sherman |author-first3=Jon D. |author-last3=Waisnor}}</ref>
<ref name="Oilman_2008">{{cite web |url=http://oilman.new21.net/zero/zboard.php?id=LXAP&page=3&sn1=&divpage=1&sn=off&ss=on&sc=on&select_arrange=headnum&desc=asc&no=1234 |script-title=ko:200LX 어플 자료실 |language=ko |archive-url=https://web.archive.org/web/20161231163628/http://oilman.new21.net/zero/zboard.php?id=LXAP&page=3&sn1=&divpage=1&sn=off&ss=on&sc=on&select_arrange=headnum&desc=asc&no=1234 |archive-date=2016-12-31 |date=2008-11-17 |url-status=live}}</ref>
<ref name="HPmuseum">{{cite web |url=https://www.hpmuseum.org/therest.htm |archive-url=https://web.archive.org/web/20161231163912/http://www.hpmuseum.org/therest.htm |archive-date=2016-12-31 |title=The Other Models |website=The Museum of HP Calculators |url-status=live}}</ref>
<ref name="Auw_2012">{{cite web |url=https://jimmyauw.com/2012/06/19/restoring-vintage-gear-hp-palmtop-200lx/ |title=Restoring Vintage Gear: HP Palmtop 200LX |date=2012-06-19 |author-first=Jimmy |author-last=Auw |website=Jimmy's Junkyard}}</ref>
<ref name="Hall_700LX">{{cite web |url=https://www.palmtoppaper.com/ptphtml/24/pt240021.htm |title=HP's OmniGo 700LX Communicator Plus |author-first=Rich |author-last=Hall |website=HP Palmtop Paper Online}}</ref>
<ref name="Marshall_1991">{{cite magazine |title=Computing in the palm of you hand |date=1991-12-16 |magazine=[[InfoWorld]] |volume=13 |issue=50 |pages=69–81 |url=https://books.google.com/books?id=HD0EAAAAMBAJ&pg=PA72 |access-date=2016-11-26 |author-first=Patrick |author-last=Marshall |editor-first1=Siobhan |editor-last1=Nash |editor-first2=Sebastian |editor-last2=Rupley}}</ref>
<ref name="Matzkin_1991">{{cite magazine |title=Hewlett-Packard Co. HP 95LX Palmtop PC |date=July 1991 |magazine=[[PC Magazine]] |author-first=Jonathan |author-last=Matzkin |volume=10 |issue=13 |pages=216, 220, 222 |url=https://books.google.com/books?id=YfkUKcyI7KIC&pg=PT231 |access-date=2016-11-26}}</ref>
<ref name="Goldstein">{{cite web |url=https://www.palmtoppaper.com/ptphtml/24/pt24001e.htm |title=User to User: The HP OmniGo 100 |author-first=Hal |author-last=Goldstein |website=HP Palmtop Paper Online}}</ref>
<ref name="Hermocon">[https://hermocom.com/hplx.html Hermocom.com helps with self-repair advice] {{webarchive|url=https://web.archive.org/web/20080907105133/http://www.hermocom.com/en/services/hplx|date=2008-09-07}}</ref>
<ref name="Repair">[https://www.palmtoppaper.com/ Thaddeus Computing offers professional repair service in USA.]</ref>
<ref name="Bel">[https://200lx.net/ Michel Bel can help with repairs in the Netherlands.]</ref>
<ref name="Tamiya_2000">{{cite web |author-last=Tamiya |author-first=Maya |title=Beyond free software in Japan |url=https://lwn.net/2000/features/ohpa-ost/ |website=[[LWN.net]] |access-date=2021-05-16 |date=2000-05-04}}</ref>
<ref name="Mynavi_2001">{{cite web |script-title=ja:ユーザーが作るモバイル端末「Morphy One」、量産用試作基板の実装が完了 |trans-title=First prototype of the Morphy One open-source mobile terminal showcased |publisher=Mynavi News |date=2001-05-07 |url=http://news.mynavi.jp/news/2001/05/07/12.html |access-date=2013-10-11 |url-status=dead |archive-url=https://web.archive.org/web/20160305224210/http://news.mynavi.jp/news/2001/05/07/12.html |archive-date=2016-03-05 |language=ja}}</ref>
<ref name="ASCII_2002">{{cite magazine |script-title=ja:モルフィーワン計画が中止の危機？ 渦中の開発者に聞く |trans-title=Morphy One cancelled? Developers speak out |magazine=[[ASCII (magazine)|ASCII.jp]] |date=2002-06-28 |url=https://ascii.jp/elem/000/000/331/331887/ |access-date=2013-10-11 |language=ja}}</ref>
<ref name="Minix">{{cite web |url=http://minix.technoir.org/ |title=Minix for the HP200LX |access-date=2005-03-12 |url-status=dead |archive-url=https://web.archive.org/web/20060828125731/http://minix.technoir.org/ |archive-date=2006-08-28}}</ref>
<ref name="HP_2012">{{cite journal |title=History of the HP 95LX computer |journal=HPNEWS |publisher=[[Hewlett-Packard Development Company, L.P.]] |date=2012 |url=http://www.hp.com/hpinfo/abouthp/histnfacts/museum/personalsystems/0025/0025history.html |access-date=2023-11-25 |url-status=live |archive-url=https://web.archive.org/web/20231124234753/http://www.hp.com/hpinfo/abouthp/histnfacts/museum/personalsystems/0025/0025history.html |archive-date=2023-11-24}}</ref>
</references>

==Further reading==
* {{cite magazine |title=The Evolution of the HP Palmtops - An HP engineer on both design teams describes the development of the HP 95LX and HP 100LX. |author-first=Everett |author-last=Kaser |location=Hewlett-Packard Company |date=November–December 1993 |volume=1993 |issue=12 |magazine=[[The HP Palmtop Paper]] |publisher=[[Thaddeus Computing, Inc.]] |url=https://www.palmtoppaper.com/ptphtml/12/pt120055.htm |access-date=2023-11-25 |url-status=live |archive-url=https://web.archive.org/web/20231125010529/https://www.palmtoppaper.com/ptphtml/12/pt120055.htm |archive-date=2023-11-25}} [https://web.archive.org/web/20231125005038/http://www.retroisle.com/others/hp95lx/Articles/evolution.php]
* {{cite web |title=The First Real Palmtop |author-first=Chris |author-last=Lott |date=2020-12-21 |work=Hackaday |url=https://hackaday.com/2020/12/21/the-first-real-palmtop/ |access-date=2023-11-25 |url-status=live |archive-url=https://web.archive.org/web/20231125010202/https://hackaday.com/2020/12/21/the-first-real-palmtop/ |archive-date=2023-11-25}}
* {{cite web |title=The story of the 1991 HP DOS Palmtop - Evolving from an enhanced calculator... to a full DOS compatible PC in your pocket. |author-first=Bryan |author-last=Lunduke |date=2022-08-01 |work=Substack / The Lunduke Journal of Technology |url=https://lunduke.substack.com/p/the-story-of-the-1991-hp-dos-palmtop |access-date=2023-11-24 |url-status=live |archive-url=https://web.archive.org/web/20231124234241/https://lunduke.substack.com/p/the-story-of-the-1991-hp-dos-palmtop |archive-date=2023-11-24}} [https://web.archive.org/web/20231121202746/https://lunduke.locals.com/upost/4897406/the-story-of-the-1991-hp-dos-palmtop]
* [https://web.archive.org/web/20050609031158/http://www.crypticlife.net/attic/www/hp200lx/lx-rev.htm The HP&nbsp;200LX: A Review] by Rob Tillotson.
* [https://web.archive.org/web/20070927172418/http://jrandomhacker.info/Sy's_hp200lx_review Sy's HP&nbsp;200LX review]
* [https://www.palmtoppaper.com/PTPHTML/51/51000019.htm Articles concerning the NASA STS-95 E-Nose experiment]
* [https://www.palmtoppaper.com/PTPHTML/51/5100001a.htm "Off-the-Shelf" 200LX used by "Shade Tree Engineer"]
* [https://www.palmtoppaper.com/ptphtml/51/5100001b.htm The Electronic Nose and The Quadrupole Mass Spectrometer Array:]
* [https://enose.jpl.nasa.gov/publications/99-0780.pdf Results From The Space Shuttle STS-95 Electronic Nose Experiment]
* [https://old-computers.com/museum/computer.asp?st=1&c=1088 HP&nbsp;200LX] Old-Computers.com Museum

==External links==
* [http://mizj.com 200LX Software S.U.P.E.R. software mirror, over 1500 programs and 200 databases for the 200LX]
* [https://www.palmtoppaper.com HP Palmtop Paper Online (Thaddeus Computing; Buy-Sell-Repair)]
* [https://www.lokety.com/hpr_index.html HP Palmtop Ring Homepage]
* [https://web.archive.org/web/20110727221518/http://www.skolob.co.uk/skolob/index.php?op=ViewArticle&articleId=2&blogId=1 Skolob's Hewlett Packard 95LX Palmtop Page (Information and FAQ on HP&nbsp;95LX)]
* [https://www.vintage-computer.com/vcforum/showthread.php?38300-Networking-on-an-HP-palmtop Compatibility of the Sohoware ND5120 network card.]

{{Hewlett-Packard}}

[[Category:HP palmtops|200LX]]
[[Category:Computer-related introductions in 1994]]
[[Category:IBM PC compatibles]]