Editing Personal digital assistant

{{short description|Multi-purpose mobile device}} 
{{More citations needed|date=April 2025}}
{{distinguish|Virtual assistant}}
{{For|the modern successor|smartphone}}
{{Use dmy dates|date=August 2024}}
[[Image:PalmTX.jpg|thumb|The [[Palm TX]]]]

A '''personal digital assistant''' ('''PDA''') is a multi-purpose mobile device which functions as a personal information manager. Following a boom in the 1990s and 2000s, PDAs were mostly displaced by the widespread adoption of more highly capable [[smartphone]]s, in particular those based on [[iOS]] and [[Android (operating system)|Android]] in the late 2000s, and thus saw a rapid decline.<ref name="Obsolete CompTIA">{{cite book |title=CompTIA Strata Study Guide |author=Andrew Smith, Faithe Wempen |year=2011 |publisher=John Wiley & Sons |isbn=978-0-470-97742-2 |page=140 |access-date=5 July 2012 |url=https://books.google.com/books?id=VnXyJVotz2QC&q=%22Personal+digital+assistant%22+obsolete&pg=PA140}}</ref><ref name="GoldenAge">{{cite web |title=The Golden Age of PDAs |url=https://www.pcmag.com/news/the-golden-age-of-pdas |website=[[PC Magazine]] |archive-url=https://web.archive.org/web/20200924091259/https://www.pcmag.com/news/the-golden-age-of-pdas |archive-date=September 24, 2020 |url-status=live |date=November 20, 2018 |first=Benj |last=Edwards}}</ref>

A PDA has an electronic visual display. Most models also have audio capabilities, allowing usage as a [[portable media player]], and also enabling many of them to be used as telephones. By the early 2000s, nearly all PDA models had the ability to access the [[Internet]], [[intranets]] or [[extranets]] via Wi-Fi or [[wireless WAN]]s, and since then generally included a [[web browser]]. Sometimes, instead of buttons, later PDAs employ [[touchscreen]] technology.

== History ==
[[File:Psion Organiser 1.jpg|thumb|Psion Organiser I (1984)]]
The first PDA, the [[Psion Organiser|Organiser]], was released in 1984 by [[Psion (company)|Psion]], followed by [[Psion Series 3|Psion's Series 3]], in 1991. The latter began to resemble the more familiar PDA style, including a full keyboard.<ref>{{cite web |title=The Protea Story |url=https://www.theregister.co.uk/2007/06/26/psion_special/page2.html |website=The Register |access-date=10 August 2017 |archive-date=1 July 2013 |archive-url=https://web.archive.org/web/20130701113216/http://www.theregister.co.uk/2007/06/26/psion_special/page2.html |url-status=dead }}</ref><ref>{{cite web|url=http://stevelitchfield.com/historyofpsion.htm|title=The History of Psion|access-date=9 June 2015 |archive-url=https://web.archive.org/web/20110722160759/https://stevelitchfield.com/historyofpsion.htm |archive-date=July 22, 2011 |url-status=live |publisher=Palmtop Magazine |via=Clove Technology |first=Steve |last=Litchfield |year=1998}}</ref> The term ''PDA'' was first used on 7 January 1992 by [[Apple Inc.]] CEO [[John Sculley]] at the [[Consumer Electronics Show]] in [[Las Vegas Valley|Las Vegas]], [[Nevada]], referring to the [[Apple Newton]].<ref>[https://techland.time.com/2012/06/01/newton-reconsidered/ Newton, Reconsidered] – ''[[Time (magazine)|Time magazine]]'', 1 June 2012</ref>

[[File:Apple Newton MessagePad (1993) - Computer History Museum.jpg|thumb|[[Apple Newton]] MessagePad (1993) – [[Computer History Museum]]]]
In 1994, [[IBM]] introduced the first PDA with analog cellular phone functionality, the [[IBM Simon]], which can also be considered the first smartphone. Then in 1996, [[Nokia]] introduced a PDA with digital cellphone functionality, the [[Nokia 9000 Communicator|9000 Communicator]].

Another early entrant in this market was [[Palm, Inc.|Palm]], with a [[Palm (PDA)|line of PDA products]] which began in March 1996.<ref>{{cite web| url=https://www.zdnet.com/article/ten-years-on-revisiting-palms-first-pilot/ |archive-url=https://web.archive.org/web/20250409093647/https://www.zdnet.com/article/ten-years-on-revisiting-palms-first-pilot/ |archive-date=April 9, 2025 |title=Ten years on, revisiting Palm's first Pilot |date=March 27, 2006 |publisher=[[Zdnet]] |url-status=live |first=Tom |last=Krazit}}</ref> Palm would eventually be the dominant vendor of PDAs until the rising popularity of [[Pocket PC]] devices in the early 2000s.<ref>{{Cite web|url=https://www.cnet.com/news/palms-market-position-erodes/|title = Palm's market position erodes |first=Margaret |last=Kane |date=January 31, 2002 |publisher=[[Cnet]] |archive-url=https://web.archive.org/web/20220810150153/https://www.cnet.com/culture/palms-market-position-erodes/ |archive-date=August 10, 2022 |url-status=live}}</ref>

By the mid-2000s most PDAs had morphed into smartphones as classic PDAs without cellular radios were increasingly becoming uncommon.<ref name="GoldenAge"/>

==Typical features==
A typical PDA has a touchscreen for navigation, a memory card slot for data storage,<ref name="lenovo">{{cite web |url=https://www.lenovo.com/us/en/glossary/pda/ |archive-url=https://web.archive.org/web/20240429083159/https://www.lenovo.com/us/en/glossary/pda/ |archive-date=April 29, 2024 | title=What is a personal digital assistant (PDA)? |website=Lenovo |access-date=April 9, 2025 |url-status=live}}</ref> and [[Infrared Data Association|IrDA]], [[Bluetooth]] and/or [[Wi-Fi]]. However, some PDAs may not have a touchscreen, using [[soft key]]s, a directional pad, and a numeric keypad or a [[thumb keyboard]] for input. To have the functions expected of a PDA, a device's software typically includes an [[Calendaring software|appointment calendar]],<ref name="lenovo"/> a [[to-do list]], an [[address book]] for contacts, a [[calculator]], and some sort of [[memorandum|memo]] (or "note") program.<ref name="lenovo"/> PDAs with wireless data connections also typically include an [[email client]] and a Web browser, and may or may not include [[telephony]] functionality.

===Touchscreen===
[[File:Palm-IMG 7024.jpg|thumb|PalmPilot organiser on display at the [[Musée Bolo]], [[École Polytechnique Fédérale de Lausanne|EPFL]], [[Lausanne]]]]
Many of the original PDAs, such as the [[Apple Newton]] and [[Palm Pilot]], featured a [[touchscreen]] for user interaction, having only a few buttons—usually reserved for shortcuts to often-used programs. Some touchscreen PDAs, including [[Windows Mobile]] devices, had a detachable [[Stylus (computing)|stylus]] to facilitate making selections.<ref name="lenovo"/> The user interacts with the device by tapping the screen to select buttons or issue commands, or by dragging a finger (or the stylus) on the screen to make selections or scroll.<ref name="lenovo"/>

Typical methods of entering text on touchscreen PDAs include:

* A [[virtual keyboard]], where a keyboard is shown on the touchscreen. Text is entered by tapping the on-screen keyboard with a finger or stylus.
* An external [[keyboard (computing)|keyboard]] connected via [[USB]], [[Infrared port]], or Bluetooth. Some users may choose a [[chorded keyboard]] for one-handed use.
* [[Handwriting recognition]], where letters or words are written on the touchscreen, often with a stylus, and the PDA converts the input to text. Recognition and computation of handwritten horizontal and vertical formulas, such as "1 + 2 =", may also be a feature.
* Stroke recognition allows the user to make a predefined set of strokes on the touchscreen, sometimes in a special input area, representing the various characters to be input. The strokes are often simplified character shapes, making them easier for the device to recognize. One widely known stroke recognition system is Palm's [[Graffiti (Palm OS)|Graffiti]].

Despite research and development projects, end-users experienced mixed results with handwriting recognition systems. Some found it frustrating and inaccurate, while others were satisfied with the quality of the recognition.<ref>{{cite magazine |url=https://www.wired.com/gadgets/mac/commentary/cultofmac/2002/08/54580 |title=Apple's Newton Just Won't Drop |last=Kahney |first=Leander |date=29 August 2002 |magazine=Wired |publisher=Condé Nast Publications |access-date=21 August 2010 |url-status=dead |archive-url=https://web.archive.org/web/20100902084536/http://www.wired.com/gadgets/mac/commentary/cultofmac/2002/08/54580 |archive-date=2 September 2010 }}
* {{cite web|archive-url=https://web.archive.org/web/20080416113926/http://www.smalldog.com/newsarchive/kibbles_display.php?id=29|archive-date=16 April 2008|title=Kibbles&Bytes #29: Don's Review of the Newton Message Pad 2000|publisher=Small Dog Electronics|last=Mayer|first=Don|date=1 July 1997|access-date=18 February 2011|url=http://www.smalldog.com/newsarchive/kibbles_display.php?id=29}}
* {{cite web|url=http://www.h-net.org/~mac/mp2000.html|title=The Postgraduate Newton: a month in academia with Apple's new handheld computer|date=May 1997|first=Geoffrey|last=Klingsporn|publisher=The History and Macintosh Society|access-date=21 August 2010|at=note-taking}}
* {{cite web|url=http://perlnet.umephy.maine.edu/bio/wittmann/pooter/newtuse/hwr.html|title=What's Right With The Newton: Part I: Handwriting recognition|first=Michael C.|last=Wittmann|access-date=21 August 2010|url-status=dead|archive-url=https://archive.today/20060908164609/http://perlnet.umephy.maine.edu/bio/wittmann/pooter/newtuse/hwr.html|archive-date=8 September 2006}}</ref>

Touchscreen PDAs intended for business use, such as the [[BlackBerry]] and [[Palm Treo]], usually also offer full keyboards and [[scroll wheel]]s or thumbwheels to facilitate data entry and navigation. Multiple touchscreen PDAs support some form of external keyboard as well. Specialized folding keyboards, which offer a full-sized keyboard but collapse into a compact size for transport, were made available for multiple models. External keyboards may attach to the PDA directly, using a cable, or may use wireless technology such as infrared or Bluetooth to connect to the PDA. Newer PDAs, such as the [[HTC HD2]], [[Palm Pre]], [[Palm Pre Plus|Pre Plus]], [[Palm Pixi|Pixi]], and [[Palm Pixi Plus|Pixi Plus]], as well as devices running the [[Android (operating system)|Android]] operating system, include more advanced forms of touchscreen that can register multiple touches simultaneously. These "[[multi-touch]]" displays allow for more sophisticated interfaces using various gestures entered with one or more fingers.

===Memory cards===
Although many early PDAs did not have [[memory card]] slots, later models had either some form of [[Secure Digital]] (SD) slot,<ref name="lenovo"/> a [[CompactFlash]] slot or a combination of the two. Although designed for memory, [[Secure Digital Input/Output]] (SDIO) and CompactFlash cards were made available that provided [[peripheral]] accessories like Wi-Fi or digital cameras to devices with software support. Some PDAs also have a USB port, mainly for [[USB flash drive]]s.{{Dubious|date=August 2010}}  Some PDAs use [[microSD]] cards, which are electronically compatible with SD cards, but have a much smaller physical size.

===Wired connectivity===
While early PDAs connected to a user's personal computer via [[serial port]]s and other proprietary connections{{Specify|date=August 2010}}, later models connect via a [[USB cable]]. Older PDAs were unable to [[USB On-The-Go|connect to each other via USB]], as their implementations of USB did not support acting as the "host". Some early PDAs were able to connect to the Internet indirectly by means of an external modem connected via the PDA's serial port or "sync" connector,<ref>{{cite web |title=Palm PDA Cables |url=http://www.deepwave.net/articles/palm/palm_cables |access-date=21 August 2010 |work=DeepWave |author=Patrick |date=14 December 2006|archive-url=https://web.archive.org/web/20100830100720/http://www.deepwave.net/articles/palm/palm_cables|archive-date=30 August 2010 |publisher=Patrick Khoo}}</ref> or directly by using an expansion card that provided an [[Ethernet]] port.

===Wireless connectivity===
Most PDAs use Bluetooth, a popular wireless protocol for mobile devices. Bluetooth can be used to connect keyboards, headsets, [[Global Positioning System|GPS receivers]], and other nearby accessories. It is also possible to transfer files between PDAs that have Bluetooth. Multiple PDAs have Wi-Fi wireless network connectivity and can connect to Wi-Fi hotspots.<ref name="MC55A0">{{cite web |title=MC55A0 Rugged Wi-Fi Enterprise Mobile Computer |url=https://www.motorola.com/Business/US-EN/Business+Product+and+Services/Mobile+Computers/Handheld+Computers/MC55A0 |access-date=26 January 2013 |archive-date=1 May 2013 |archive-url=https://web.archive.org/web/20130501003031/http://www.motorola.com/Business/US-EN/Business+Product+and+Services/Mobile+Computers/Handheld+Computers/MC55A0 |url-status=dead }}</ref> All smartphones, and some other PDAs, can connect to [[wireless wide area network]]s, such as those provided by cellular telecommunications companies. Older PDAs, from the 1990s to 2006, typically had an [[IrDA]] ([[infrared]]) port allowing short-range, line-of-sight wireless communication. Few later models used this technology, as it had been supplanted by Bluetooth and Wi-Fi. IrDA allows communication between two PDAs, or between a PDA and any device with an IrDA port or adapter. Some contemporary printers have IrDA receivers,<ref>For example: {{cite web|url=http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=bpl02556|title=HP LaserJet 5P and 5MP Printers&nbsp;— Product Specifications|work=HP Business Support Center|publisher=Hewlett-Packard|url-status=dead|archive-url=https://web.archive.org/web/20050425035915/http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=bpl02556|archive-date=25 April 2005|access-date=21 August 2010}}</ref> allowing IrDA-equipped PDAs to print to them, if the PDA's [[operating system]] supports it. Universal PDA keyboards designed for these older PDAs use infrared technology,{{Citation needed|date=August 2010}} due to cost and a lack of wireless interference.{{Specify|reason=aboard what?}}

===Synchronization===
Most PDAs can [[data synchronization|synchronize]] their data with applications on a user's computer, allowing the user to update contact, schedule, or other information on their computer, using software such as [[Microsoft Outlook]] or [[ACT!]], and have that same data transferred to the PDA—or transfer updated information from the PDA back to the computer, eliminating the need for the user to update their data in two places. Synchronization also prevents the loss of information stored on the device if it is lost, stolen, or destroyed. When the PDA is repaired or replaced, it can be "re-synced" with the computer, restoring the user's data. Some users found that data input was quicker on their computer than on their PDA since text input via a touchscreen or small-scale keyboard was slower than a full-size keyboard. Transferring data to a PDA via the computer was, therefore, a lot quicker than having to manually input all data on the handheld device.{{Citation needed|date=August 2010}}

Most PDAs come with the ability to synchronize to a computer. This is done through ''synchronization software'' provided with the handheld, or sometimes with the computer's operating system. Examples of synchronization software include:

* [[HotSync]] Manager, for [[Palm OS]] PDAs
* Microsoft [[ActiveSync]], used by [[Windows XP]] and older Windows operating systems to synchronize with [[Windows Mobile]], [[Pocket PC]], and [[Windows CE]] PDAs, as well as PDAs running [[iOS]], Palm OS, and [[Symbian]]
* Microsoft [[Windows Mobile Device Center]] for [[Windows Vista]], which supports Windows Mobile and [[Pocket PC]] devices
* Apple [[iTunes]] used on [[Mac OS X]] and Microsoft Windows to sync iOS devices
* [[iSync]], included with Mac OS X, can synchronize many [[SyncML]]-enabled PDAs
* BlackBerry Desktop Software, used to sync [[BlackBerry]] devices.

These programs allow the PDA to be synchronized with a [[personal information manager]], which may be part of the computer's operating system, provided with the PDA, or sold separately by a third party. For example, the RIM BlackBerry came with RIM's ''Desktop Manager'' program, which can synchronize to both Microsoft Outlook and ACT!. Other PDAs come only with their own proprietary software. For example, some early Palm OS PDAs came only with [[Palm Desktop]], while later Palm PDAs—such as the [[Treo 650]]—have the ability to sync to Palm Desktop or Microsoft Outlook. Microsoft's ActiveSync and Windows Mobile Device Center only synchronized with Microsoft Outlook or [[Microsoft Exchange Server]].{{Citation needed|date=August 2010}} Third-party synchronization software was also available for some PDAs from companies like CommonTime<ref>{{cite web|url=http://www.commontime.com/|archive-url=https://web.archive.org/web/19970530205947/http://www.commontime.com/|url-status=dead|archive-date=30 May 1997|title=CommonTime – Cross-platform mobile app development tools|work=CommonTime|access-date=9 June 2015}}</ref> and [[CompanionLink]].<ref>{{cite web|url=http://www.companionlink.com/|title=Sync calendar, contacts, tasks and notes to Android, iPhone, iPad, BlackBerry – CompanionLink|access-date=9 June 2015}}</ref> Third-party software can be used to synchronize PDAs to other personal information managers that are not supported by the PDA manufacturers (for example, GoldMine and [[IBM Lotus Notes]]).

====Wireless synchronization====
Some PDAs can synchronize some or all of their data using their wireless networking capabilities, rather than having to be directly connected to a personal computer via a cable. Devices running Palm's [[webOS]] or Google's [[Android (operating system)|Android operating system]] primarily sync with the [[Cloud computing|cloud]]. For example, if [[Gmail]] is used, information in contacts, email, and calendars can be synchronized between the PDA and Google's servers. RIM sold [[BlackBerry Enterprise Server]] to corporations so that corporate BlackBerry users could wirelessly synchronize their PDAs with the company's [[Microsoft Exchange Server]], IBM [[Lotus Domino]], or [[Novell GroupWise]] servers.<ref>{{cite web |title=BlackBerry&nbsp;— Enterprise Server&nbsp;— BlackBerry BES Server |url=http://us.blackberry.com/business/software/bes/overview.html |access-date=21 August 2010 |publisher=Research in Motion |url-status=dead |archive-url=https://web.archive.org/web/20120713073104/http://us.blackberry.com/business/software/bes/overview.html |archive-date=13 July 2012 }}</ref> Email, calendar entries, contacts, tasks, and memos kept on the company's server are automatically synchronized with the BlackBerry.<ref>{{cite web|url=http://us.blackberry.com/business/software?LID=us:bb:software:businesssoftware&LPOS=us:bb:software|title=BlackBerry&nbsp;— Business Software Features|publisher=Research in Motion|url-status=live|archive-url=https://web.archive.org/web/20120416171116/http://us.blackberry.com/business/software?LID=us:bb:software:businesssoftware&LPOS=us:bb:software|archive-date=2012-04-16|access-date=21 August 2010}}</ref>

==Operating systems of PDAs==
The most common operating systems pre-installed on PDAs are:

* [[Palm OS]]
* Microsoft [[Windows Mobile]] (Pocket PC) with a [[Windows CE]] kernel

Other, rarely used operating systems:

* [[EPOC (operating system)|EPOC]], then [[Symbian OS]] (in mobile phone + PDA combinations)
* [[Linux]] (e.g. VR3, [[iPAQ]],<ref>{{cite web|url=http://asia.cnet.com/alternative-operating-systems-on-your-pda-38031433.htm|title=Ernest Khoo: Alternative operating systems on your PDA|url-status=dead|archive-url=https://web.archive.org/web/20120810111712/http://asia.cnet.com/alternative-operating-systems-on-your-pda-38031433.htm|archive-date=2012-08-10}}</ref> [[Sharp Zaurus]] PDA, Opie, [[GPE Palmtop Environment|GPE]], [[Familiar Linux]]<ref>{{cite web|url=http://www.bytebot.net/media/pda-os-01032005.html|title=Highlights: Knowing the differences in PDA operating systems|access-date=9 June 2015}}</ref> etc.)
* [[Newton (platform)|Newton]]
* [[QNX]] (also on [[iPAQ]])

==Automobile navigation==
Some PDAs include [[Global Positioning System]] (GPS) receivers. Other PDAs are compatible with external GPS-receiver add-ons that use the PDA's processor and screen to display location information.<ref>{{cite web |url=http://portal.palm.com/wps/portal/kb/na/gps/palmgpsnavigator3207na/unlocked/home/page_en.html |archive-url=https://archive.today/20120714003754/http://portal.palm.com/wps/portal/kb/na/gps/palmgpsnavigator3207na/unlocked/home/page_en.html |url-status=dead |archive-date=14 July 2012 |title=Palm Support: Palm GPS Navigator 3207NA |access-date=21 August 2010 }}</ref> PDAs with GPS functionality can be used for automotive navigation. Integrated PDAs were fitted as standard on new cars throughout the 2000s. PDA-based GPS can also display traffic conditions, perform dynamic routing, and show known locations of roadside mobile radar guns. [[TomTom]], [[Garmin]], and [[iGO (software)|iGO]] offered GPS navigation software for PDAs.

==Ruggedized==
Some businesses and government organizations rely upon rugged PDAs, sometimes known as [[enterprise digital assistant]]s (EDAs) or [[mobile computers]], for mobile data applications. These PDAs have features that make them more robust and able to handle inclement weather, jolts, and moisture. EDAs often have extra features for data capture, such as [[barcode reader]]s, [[radio-frequency identification]] (RFID) readers, [[magnetic stripe card]] readers, or [[smart card]] readers. These features are designed to facilitate the use of these devices to scan product or item codes.

Typical applications include:

* Access control and security
* [[Capital asset]] maintenance
* Facilities maintenance and management
* Infection control audit and surveillance within healthcare environments
* Medical treatment and recordkeeping in hospitals
* Meter reading by utilities
* Military
* Package delivery
* Park and wildlife rangers
* Parking enforcement
* Route accounting
* Supply chain management in warehouses
* Taxicab allocation and routing
* Waiter and waitress applications in restaurants and hospitality venues
* Wildlife biologists

==Educational uses==
{{Refimprove section|date=August 2010}}

PDAs and handheld devices were allowed in multiple classrooms for digital note-taking. Students could spell-check, modify, and amend their class notes on a PDA. Some educators{{Who|date=August 2010}} distributed course material through the Internet or infrared file-sharing functions of the PDA. Textbook publishers released [[e-book]]s, which can be uploaded directly to a PDA, reducing the number of textbooks students were required to carry.<ref>{{cite web|url=http://www.centredaily.com/2010/08/20/2161625/10-tips-to-save-on-college-textbooks.html |title=10 tips to save on college textbooks |publisher=Centre Daily Times |date=20 August 2010 |access-date=21 August 2010 |url-status=dead |archive-url=https://web.archive.org/web/20100823051729/http://www.centredaily.com/2010/08/20/2161625/10-tips-to-save-on-college-textbooks.html |archive-date=23 August 2010 }}</ref> Brighton and Sussex Medical School in the UK was the first medical school to provide wide scale use of PDAs to its undergraduate students. The learning opportunities provided by having PDAs complete with a suite of key medical texts were studied with results showing that learning occurred in context with timely access to key facts and through consolidation of knowledge via repetition. The PDA was an important addition to the learning ecology rather than a replacement.<ref>{{cite journal|title=Mobile Medical Education (MoMEd) – how mobile information resources contribute to learning for undergraduate clinical students – a mixed methods study|first1=Bethany S.|last1=Davies|first2=Jethin|last2=Rafique|first3=Tim R.|last3=Vincent|first4=Jil|last4=Fairclough|first5=Mark H.|last5=Packer|first6=Richard|last6=Vincent|first7=Inam|last7=Haq|date=1 January 2012|journal=BMC Medical Education|volume=12|pages=1|doi=10.1186/1472-6920-12-1|pmid=22240206|pmc=3317860 |doi-access=free }}</ref> Software companies also developed PDA programs to meet the instructional needs of educational institutions, such as dictionaries, [[thesauri]], [[word processing]] software, encyclopedias, [[webinars]] and digital lesson planners.

===Recreational uses{{Anchor|Sporting uses}}===
PDAs were used by music enthusiasts to play a variety of music file formats. Many PDAs include the functionality of an [[MP3 player]]. [[Rallying|Road rally]] enthusiasts can use PDAs to calculate distance, speed, and time. This information may be used for navigation, or the PDA's GPS functions can be used for navigation. [[Underwater diving|Underwater divers]] can use PDAs to plan [[breathing gas]] mixtures and [[decompression schedule]]s using software such as "V-Planner".

==See also ==
{{Div col|colwidth=30em}}
* [[Automotive navigation system]]
* [[Graffiti (Palm OS)]]
* [[Information appliance]]
* [[Medical calculator]]
* [[Pen computing]]
* [[Personal navigation assistant]] (PNA)
{{div col end}}

==References==
{{Reflist|30em}}

==External links==
{{Commons category|Personal digital assistants}}
* [https://ruetersward.com/biblio.html Annotated bibliography of references to gesture and pen computing]
* [http://www.epocalc.net/php/liste_comp.php epocalc's List of PDA manufacturers]

{{Table mobile operating systems}}
{{Computer sizes}}
{{Authority control}}

{{DEFAULTSORT:Personal Digital Assistant}}
[[Category:Personal digital assistants| ]]
[[Category:Mobile computers]]
[[Category:Information appliances]]
[[Category:Time management]]