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Unformatted text preview: of computer-related functions. The number of available expansion slots varies from computer to computer. The functionality of some of the more popular add-on boards is given below. 1. Network interface card. This card, often referred to as NIC, allows a PC to be connected to a network. For example, if a PC is to be connected to an Ethernet LAN, it must be equipped with an Ethernet card. Similarly, if the PC is to be connected to an ATM network, it must be equipped with ah ATM card. 2. Fax modem card. This card allows a PC to be connected to a remote computer via a telephone-line. It also enables the PC to transfer images of hard-copy documents via telephone lines to another location just as we do using a fax (facsimile) machine. 3. Color and graphics adapter card. This card is required for interfacing a PC with video monitors that have graphics and/or color capabilities. For example, the VGA (video graphics array) board enables the interfacing of high-resolution monitors with the PC. 4. Motion video card. This card enables full-motion color video with audio to be integrated with other output on the monitor's screen. Because the card accepts multiple inputs, videos can be shown full-screen (one video input) or in windows (multiple video inputs). The system unit of a PC also has ports for connecting peripheral devices to the PC. These ports allow external input/output or storage devices (such as a printer and other devices external to the system unit box) to be plugged in to the PC in much the same way as you plug an electric equipment into an electrical socket. The two common types of ports available in almost all PCs are: 1. Serial ports. Serial ports facilitate the serial transmission of data, one bit at a time in sequence over a single wire. When a PC uses an output serial port, the 8bit bytes produced in parallel by the PC are then lined up into a single stream of bits for serial transmission to a printer or other device connected to that port. Serial ports provide an interface for low-speed printers and modems. A popular serial port standard is the RS-232C interf...
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This document was uploaded on 04/07/2014.

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