Working of pda

Answer 1

· Microprocessor · Operating System · Solid-state Memory · Batteries · LCD display · Input Device-Buttons in combination with touch-screen or keyboard · Input/Output ports Microprocessors Like standard desktop and laptop computers, PDAs are powered by microprocessors. The microprocessor is the brain of the PDA and coordinates all of the PDA's functions according to programmed instructions. The Operating systemThe operating system contains the pre-programmed instructions that tell the microprocessor what to do. Memory A PDA doesn't have a hard drive. It stores basic programs (address book, calendar, memo pad and operating system) in a read-only memory (ROM) chip, which remains intact even when the machine shuts down. The data and any programs that are added later are stored in the device's RAM. This approach has several advantages over standard PCs. When the PDA is turned on , all the programs are instantly available. One does not have to wait for applications to load. When changes are made to a file, they're stored automatically, hence a Save command is not required. And when the device is turned off, the data is still safe, because the PDA continues to draw a small amount of power from the batteries. PDAs usually come with 2 MB minimum of memory. However, many application programs take up memory space, so more advanced models usually have more memory (5 to 32 MB). Also, Pocket PC takes more memory space so PDAs with this operating system usually have 16 or 32 MB. In some PDA models, the amount of memory is upgradeable. Batteries PDAs are powered by batteries. Some models use alkaline (AAA) batteries, while others use rechargeable batteries (lithium, nickel-cadmium or nickel-metal hydride). The battery life depends on what kind of PDA one has and what it is used for. LCD Display PDAs have some type of LCD display screen. Unlike the LCD screens for desktop or laptop computers, which are used solely as output devices, PDAs use their screens for output and input. The LCD screens of PDAs are smaller than laptop screens, but vary in size. Hand-held computers generally have larger screens than palm-sized computers. Input Device PDAs vary in how the mode of inputting data and commands. Hand-held computers typically use a miniature keyboard in combination with a touch screen. Palm-sized computers use a stylus and touch screen exclusively in combination with a handwriting recognition program .Eventually, most PDAs will incorporate voice recognition technology, where one speaks into a built-in microphone while software converts voice waves into data. Input/Output Devices Because PDAs are designed to work in tandem with a desktop or laptop, they need to work with the same information in both places. If an appointment is made on the desktop computer, it needs to be transferred to the PDA; likewise if a phone number is noted on the PDA, it should be uploaded to ones PC. Everything on the PDA has to be saved to a desktop computer in case the batteries go dead in the PDA. So, any PDA must be able to communicate with a PC. The communication between PDA and PC is referred to as data synchronization or syncing. This is typically done through a serial or USB port on the PDA.

Answer 2

Let's see...... what can you do with a computer? Listless. If you have to make a list, you might have nowhere to start.

A PDA is just like a PC (or Mac, if you prefer Apple). But it's smaller - which means it's slower. Let me list everything I can think about.

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Advantages of a PDA

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1 Small, portable. You can't pull a laptop out of your pocket.

2 Faster on small tasks. It takes your laptop 30 seconds to look up a phone number, it takes fewer than 10 seconds. Just imagine if you meet an old friend that have lost contact with you, and he gave you his (to be politically correct, "or she gave you her") latest phone number, which is faster, a pad or a Working Diary?

3 Less Battery usage. I can use my PDA for a week without charging (given that I don't use my PDA as a MP3 player), but that depends on what device you have and how you use it.

Disadvantages of a PDA

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1 relatively slower. I mean, it is faster when you look up a number, but you surely didn't count on playing CS on a PDA, did you?

2 Fewer programs. Unless you are a programmer, and you have enough time, and you're patient enough, and you still have a proper income, you'd have to deal with this - sometimes a you can't find a PDA equivalent of a desktop program.

3 relatively expensive. With a thousand bucks you can get a pretty good PDA, and a not bad laptop. What do you want is on your own. After all, a laptop is more powerful (as in, an elephant can lift better than an ant).

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So, have I answered your question?

Answer 3

PDA - Personal Digital Assistant is a small form of Handheld Computer that is used to access Internet, Mail, Calendar, Memo Software & Slots for Memory Cards.

Additionally used as Mobile Phone, GPS unit and provides useful applications for daily use with Touchscreen Input.

Today's Smartphone are advanced form of PDAs in general use.