Read the text and fill in the missing words:How do PDAs work?A PDA (personal digital assistant) is a handheld organizer with phone and internet capabilities. PDAs are also called palmtops and pocket PCs. They run on Выберите...batteriesnetwork electricity .PDAs vary in how you input data and instructions. Some devices use a stylus to write, draw or make selections on a Выберите...touch-sensitivetouch-nonsensitive LCD screen. Software inside the PDA recognizes hand-witten characters and converts them into editable text. If the device doesn't incorporate Выберите...handwriting recognitionspeach recognition , you use the stylus to tap on the letters of a miniature on-screen keyboard. In addition, many devices now include a small QWERTY keyboard. They may also have a Выберите...speech recognitionhandwriting recognition system, which reacts to the user's voice, and a few buttons to launch programs and scroll through the files.As for the operating system, most PDAs run on Windows Mobile or Palm OS. However, Blackberry wireless devices use RIM, from Research in Motion, and Nokia and Samsung smartphones use the Symbian OS. A smartphone is a full-featured mobile phone with PDA capabilities.Today's PDAs come with PIM software that lets you manage Выберите...personal informationpublic information , such as contacts, appointments and to-do lists. They can be used as a radio or MP3 player, play games, record voice and video, act as GPS devices, and connect to the Internet through Wi-F access points or cellular data networks. Some PDAs can also run pocket versions of MS Word, Excel, a web browser and email program.PDA processors are smaller, cheaper and less powerful than those in Выберите...standard PCstelephones . A widely used microprocessor is ARM, based on RISC (reduced instruction set computer) architecture, which reduces chip complexity by using simpler instructions. Unlike standard computers, PDAs don't have Выберите...a hard diskmemory storage capacbilities ; they store the basic programs (operating system, calendar, calculator, etc.) in a ROM chip. The programs that you add and the data processed are held in the RAM chips. The newest PDAs use flash memory instead of RAM. Flash memory is non-volatile - i.e. it retains its information when the power is off. Flash memory cards are ideal for storing the user's favourite music, picture and video files.Most models can syncronize to a PC - i.e. exchange data and update it - in case you want to access the same data on both devices. To syncronize and transfer data, you need to connect your PDA to a standard PC via a USB cable or wirelessly. Modern devices support two types of wireless connection: IrDA, which uses infrared light beams similar to TV remote controls, and Bluetooth,which uses radio waves to communicate over Выберите...short distanceslong distances with Bluetooth-enabled devices (laptops, mobiles, etc.).