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Cache reduces the average time required by the 92 UsersManual microprocessor to get the data it needs from the main memory by storing recently accessed data in the cache. CardBus CardBus technology enables the computer to use 32-bit PC Cards. Hardware in the computer and the Windows operating system provide support for the 32-bit cards. The voltage of 32-bit cards (3.3 volts) is lower than that of 16-bit cards (5 volts). The 32-bit cards can transmit more data at a time than the 16-bit cards, thus increasing their speed. CMOS memory CMOS (complementary metal oxide semiconductor) memory is powered by the CMOS battery. The System Setup settings and other parameters are maintained in CMOS memory. Even when you turn your computer off, the information in CMOS memory is saved. COM port COM stands for communication. COM ports are the serial ports in your computer. Compact Disc A compact disc (CD). Conventional memory The first 640 KB of system memory. Operating systems and application programs can directly access this memory without using memory-management software. Disk The device used by the computer to store and retrieve information. Disk can refer to a floppy disk, hard disk, or RAM disk. Disk cache A software device that accumulates copies of recently used disk sectors in RAM. The application program can then read these copies without accessing the disk. This, in turn, speeds up the performance of the application. A cache is a buffer for transferring disk sectors in and out of RAM. Data stored in a disk cache is a copy of data already stored on the physical disk. DMA (direct memory access) A method of transferring data from a device to memory without having the data pass through the microprocessor. Using DMA can speed up system performance. Glossary 93 DPMS Display Power Management Signalling. Displays or monitors that comply with this can be managed by the Power Management features found in the system setup. Floppy disk A removable disk, also called floppy or diskette. Hard drive Also called fixed disk. A hard drive is connected to the computer and can be installed or removed. Data written to a hard drive remains until it is overwritten or corrupted. The 2.5-inch hard drive in your computer was designed for use in a notebook computer. Because hard drives in notebook computers are smaller than those in desktop computers, their maximum storage capacity may be less than that of desktop hard drives. However, because of their smaller size, the drives handle shock and vibration better than larger drives, which is important for a notebook computer. I/O Input/output. Refers to peripheral devices, such as printers, that are addressed throughanI/O address. I/O address I/O stands for input/output. Peripheral devices, such as printers, are addressed through the I/O port address. IRQ (interrupt request line) The IRQ is a hardware line that a device uses to signal the microprocessor when the device needs the microprocessor’s services. The number of IRQs is limited by industry standards. LCD (liquid-crystal display) The LCD screen on your computer differs from the display screen of a desktop monitor. Most desktop monitors use CRT (cathode-ray tube) displays, which work by moving an electron beam across phosphor dots on the back of the screen. The phosphor dots light up to show the image. LCDs use a liquid-crystal solution between two sheets of polarizing material. Electric current passing through the liquid aligns the crystals so that light can or cannot pass through them, creating an image. 94 UsersManual MB (megabyte) 1,024 kilobytes. Megabit 1,048,576 bits or about 128 kilobytes. Operating system A program that supervises the computer's operation, including handling I/O. Application programs and users can request operating-system services. A user might request operation-system services to copy files or format a disk. An application program might use the operating system to obtain keyboard input, write data to a file, or write data to a screen. PC Card PC Card stands for personal computer card. The Personal Computer Memory Card International Association (PCMCIA) defines the standards used to develop all PC Cards. PC Card types include: modems, Ethernet adapters, SCSI adapters, ATA cards, and memory cards. PC slot The PC slot is the hardware slot in the computer where the PC Card is placed. Pixel A pixel is an individual dot in a graphic displayed on your computer. The pixels are so close together that they look as though they are connected. An LCD screen displays thousands or millions of pixels. Plug and Play A plug and play operating system automatically configures computer components to work with your system. With this type of operating system, you normally do not need to set jumpers on devices or set memory addresses or IRQs. RAM (random access memory) The computer's system memory, including conventional and extended memory. You can write to and read from RAM. Information stored in RAM is temporary, andis erasedwhenth...

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