PDAs

PDAs are much more than address books; some handhelds are phones, internet devices, and video players.

PDAs can store thousands of phone numbers, appointments, tasks, and notes. All models can exchange, or synchronize, information with a full-sized computer. To do this, you connect the PDA to your computer with a cradle or cable. For models that run on rechargeable batteries, the cradle doubles as a charger. Infrared, Bluetooth, and Wi-Fi (wireless) let you synchronize with a computer without wires or a cradle.

Most PDAs can be made to work with both Windows and Macintosh computers, but PDAs with the Pocket PC operating system usually require third-party software for Macs. PDAs with Wi-Fi (wireless) capability can access the Internet. Many of those without can with the addition of a separately purchased modem. Most PDAs can record your voice, play videos, display digital photos, and hold maps, city guides, and books.


WHAT'S AVAILABLE



Most PDAs on the market are the familiar tablet-with-stylus type that feature a squarish display screen, a design pioneered by Palm Inc. Today the main choices are models that use the Palm operating system (OS)--mostly Palm models--and Pocket PC devices from companies like Dell. The latter use a stripped-down version of Microsoft Windows. A few PDAs use a proprietary operating system. Blackberry, Hewlett-Packard, Motorola, Nokia, Palm, Samsung, and Sony Ericsson offer units that combine a cell phone and a PDA, often referred to as smartphones.

Palm OS systems. Equipped with software to link with Windows and (for Palm-brand units) Macintosh computers, Palm units and their clones have a simple user interface. You use a stylus to enter data by tapping an onscreen keyboard or writing in shorthand known as Graffiti. Some models have a tiny tactile keyboard. Or you can download data from your computer.

Most Palm OS-based PDAs can synchronize with a variety of desktop e-mail programs, such as Outlook Express and Eudora. (Palm models with VersaMail software are good at handling e-mail with attachments.) And all include a basic personal information management (PIM) application. Palm OS units are easy to use, although navigation between different programs is cumbersome because of the operating system’s “single tasking” nature.

Most models make it difficult or impossible to replace the battery yourself. And beyond the warranty period, you can’t be sure the manufacturer will do it for you.

Most Palm OS-based models have expansion slots that let you add memory or attach separately purchased accessories. All Palm OS-based PDAs can be enhanced by adding third-party software applications. The more free memory that a model comes with, the more software it can accommodate. There is a large body of Palm OS-compatible freeware, shareware, and commercial software available for download at such sites as www.palmgear.com. Many Palm models come with Documents To Go--word-processing and spreadsheet software similar to that used in Pocket PCs but more versatile. Price: $100 to $400.

Palm’s top-of-the-line model, the LifeDrive, combines a 4-GB hard drive with many of the best features of the Pocket PC and Palm OS operating systems. When it’s connected to a Windows PC, you can drag and drop files to the LifeDrive’s hard drive, even on PCs that don’t have Palm’s desktop software installed. It’s also handy for storing photos from a digital camera that uses a MMC/SD (MultiMedia/SecureDigital) memory card and for listening to MP3 music.

Pocket PC systems. These resemble Palm OS-based models but are more like miniature computers. They have a processor with extra horsepower and come with familiar applications such as a word processor and a spreadsheet. Included is a scaled-down version of Internet Explorer, plus voice recording and perhaps some financial functions. The included e-mail program handles Word and Excel attachments easily. Also standard is an application that plays MP3 music files, as well as Microsoft Reader, an eBook application.

As you might expect, all the application software included in a Pocket PC integrates well with the Windows computer environment. You need to purchase third-party software to use a Mac. And you’ll need Microsoft Office programs such as Word, Excel, and Outlook on your computer to exchange data with a PDA. Pocket PCs have a color display and rechargeable lithium-ion batteries. Unlike most Palm OS-based PDAs, replacing the battery of most Pocket PCs is usually straightforward. Price: $200 to $600.

Ultra Mobile PCs (UMPCs). These are small, fully functional computers that run a version of Microsoft’s Windows XP. An early model, the Samsung Q1, released in 2006, has a 7-inch display, measuring 51⁄2 inches x 9 inches x 1 inch and weighing 1.7 pounds. It lacks a built-in keyboard and costs about $1,100.


HOW TO CHOOSE



Consider your ties to a computer. Pocket PCs provide a Windows-like interface that allows simple PC-to-PDA file transfer with drag-and-drop capability. They’re also more convenient than Palm OS models for setting up a Wi-Fi (wireless) e-mail connection. Most have replaceable batteries along with accessible flash memory to which you can back up data.

Palm OS models run a wider range of third-party software applications than do Pocket PCs. For the basics, they’re still easier to use. While most PDAs can sync with Macs, only Palm models do so out of the box. Programs such as Missing Sync and PocketMac support Palm OS PDAs from Garmin and others, as well as Pocket PCs that run older versions of that operating system, such as the Asus A730W. Currently, neither Missing Sync nor PocketMac support PDAs that run Microsoft Windows Mobile 5.0. Both are priced under $50.

Small size vs. extra features. As a rule, a model with a larger display or physical keyboard won’t be the lightest or smallest. A PDA with two slots for memory and peripherals is more expandable but will tend to be larger.

Personal digital assistants (PDAs) are handheld computers that were originally designed as personal organizers, but became much more versatile over ___ years. PDAs are also known as pocket computers or palmtop computers. PDAs have many uses: calculation, use as ___ clock and calendar, accessing ___ Internet, sending and receiving E-mails, video recording, typewriting and word processing, use as ___ address book, making and writing on spreadsheets, scanning bar codes, use as ___ radio or stereo, playing computer games, recording survey responses, and Global Positioning System (GPS). Newer PDAs also have both color screens and audio capabilities, enabling them to be used as mobile phones (smartphones), web browsers, or portable media players. Many PDAs can access ___ Internet, intranets or extranets via Wi-Fi, or Wireless Wide-Area Networks (WWANs). One of ___ most significant PDA characteristics is ___ presence of ___ touch screen.Typical features

Currently, ___ typical PDA has ___ touch screen for entering data and ___ memory card slot for data storage and IrDA, Bluetooth and WIFI for connectivity.
Touch screen

Many original PDAs, such as ___ Apple Newton and ___ Palm Pilot, featured touch screens for user interaction, having only ___ few buttons usually reserved for shortcuts to often used programs. Touch screen PDAs, including Windows Pocket PC devices, usually have ___ detachable stylus that can be used on ___ touch screen. Interaction is then done by tapping ___ screen to activate buttons or menu choices, and dragging ___ stylus to, for example, highlight.
Text input is usually done in one of two ways:
*Using ___ virtual keyboard, where ___ keyboard is shown on ___ touch screen. Input is done by tapping ___ letters.
*Using letter or word recognition, where letters or words are written on ___ touch screen, and then \"translated\" to letters in ___ currently activated text field. Despite rigorous research and development projects, end-users experience mixed results with this input method, with some finding it frustrating and inaccurate, while others are satisfied with ___ quality.HWR accuracy:
*See comments in Wired\'s Apple Newton Just Won\'t Drop (4 yrs later)
*See text under \"Handwriting Recognition\" in Pen Computing\'s First Look at Newton OS 2.0
*See \"Opportunity Squandered\" in Pen Computing\'s Why did Apple kill ___ Newton?
*See comments under \"Software\" in MacTech\'s MessagePad 2000 review
*Comments by Pen Computing\'s editor
*See user testing results discussed in part 6 of this ___.I. Magazine article on Newton HWR
*MessagePad 2000 review at Small Dog Electronics
*See comments under \"Note-taking\" in MessagePad 2000 review at \"___ History and Macintosh Society\"
*What\'s Right With ___ Newton: HWR Recognition and computation of handwritten horizontal and vertical formulas such as \"1 + 2 =\" was also under development.

PDAs for business use, including ___ BlackBerry and Treo, have full keyboards and scroll wheels or thumb wheels to facilitate data entry and navigation, in addition to supporting touch-screen input. There are also full-size foldable keyboards available that plug directly, or use wireless technology to interface with ___ PDA and allow for normal typing. BlackBerry also has additional functionality as push based email and applications.

Newer PDAs, such as ___ Apple iPhone include new user interfaces using other means of input. ___ iPhone uses ___ technology called Multi-touch which uses fingers as input. Whereas ___ MacsturSoft version contains ___ slightly different version of Multi-Touch which is more advanced than Apple\'s Technology. IFTIKHARMemory cards

Although many early PDAs did not have memory card slots, now most have either ___ SD (Secure Digital) and/or ___ Compact Flash slot. Although originally designed for memory, SDIO and Compact Flash cards are available for such things as Wi-Fi and Webcams. Some PDAs also have ___ USB port, mainly for USB flash drives.
Wired connectivity

While many earlier PDAs connected via serial ports or other proprietary format, many today connect via USB cable. This served primarily to connect to ___ computer, and few, if any PDAs were able to connect to each other out of ___ box using cables, as USB requires one machine to act as ___ host - functionality which was not often planned. Some PDAs were able to connect to ___ internet, either by means of one of these cables, or by using ___ extension card with ___ ethernet port/RJ-45 adaptor.
Wireless connectivity

Most modern PDAs have Bluetooth wireless connectivity, ___ increasingly popular tool for mobile devices. It can be used to connect keyboards, headsets, GPS and many other accessories, as well as sending files between PDAs. Many mid-range and superior PDAs have Wi-Fi/WLAN/802.11-connectivity, used for connecting to Wi-Fi hotspots or wireless networks. Older PDAs predominantly have ___ IrDA (infrared) port; however fewer current models have ___ technology, as it is slowly being phased out due support for Bluetooth and Wi-Fi. IrDA allows communication between two PDAs, ___ PDA and any device with ___ IrDA port or adapter. Most universal PDA keyboards use infrared technology because many older PDAs have it, and infrared technology is low-cost.

Personal digital assistant - Wikipedia, the free encyclopedia
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Article about personal digital assistants (PDAs), including their features, uses, technical details, and more.
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en.wikipedia.org/wiki/Personal_digital_assistant

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