How PDAs Work

Functions

PDAs, also known as personal data assistants or handhelds, are extensions of a personal computer. As mobile, on the go computers, they function as day planners, electronic organizers, telephones, and even have games to play on them. PDAs also have GPS capabilities and can be enabled to connect the user to the Internet for email or global search engines and any other features accessible through the Internet. They are used for listening to music and watching videos as well.

The first PDAs only provided telephone features, calculator, alarm clock, calendar, game and spreadsheet capabilities. Since their initial release on the market in the mid to late 80s, however, the features provided on PDAs have progressed dramatically, and their capabilities continue to be increased.

PDAs should be regularly, even daily, synchronized with the user's computer in an effort to ensure that all data is consistently accurate and to provide a backup for any and all information stored electronically.

Inner Workings

Programmed instructions are used to coordinate all of the functions by way of the microprocessor, which is the brain of the PDA. PDAs have a ROM (read-only memory chip) to contain the basic programs and a RAM (random access memory) to contain data and add-on programs. If the PDA does not have a RAM, then it utilizes flash memory, which keeps data preserved even when the battery is depleted.

PDAs have operating systems which are not as complex as full-size personal computers, but which still contain the pre-programmed instructions for the microprocessor.

Viewing and Power

Batteries which can last anywhere from hours to months without having to be replaced or recharged are what power PDAs. If they are not powered by a rechargeable battery, they are typically powered by alkaline batteries.

Power management systems to extend battery life are installed into most PDAs. There is also usually a backup battery within a PDA in order to prevent data loss; however, the lifespan of these can be extremely short, typically providing power to the PDA for less than one hour.

PDA data is displayed on an LCD (liquid crystal display) screen which is used for input as well as output, whereas the typical full sized personal computer only provides output capabilities. These screens have a thin-film transistor for day or nighttime viewing and have a backlight to provide more light to the viewer. There is typically also an option for changing the resolution on the screen.

Resources

• PDA Reviews