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Glossary 181headless system — A system or device that functions without having a keyboard,mouse, or monitor attached. Normally, headless systems are managed over a networkusing an Internet browser.host adapter — A host adapter implements communication between the system’s busand the controller for a peripheral device. (Hard-drive controller subsystems includeintegrated host adapter circuitry.) To add a SCSI expansion bus to your system, youmust install or connect the appropriate host adapter.Hz — Hertz.I/O — Input/output. A keyboard is an input device, and a monitor is an output device.In general, I/O activity can be differentiated from computational activity.ID — Identification.IDE — Integrated drive electronics. A standard interface between the system boardand storage devices.integrated mirroring — Provides simultaneous physical mirroring of two drives.Integrated mirroring functionality is provided by the system’s hardware. See alsomirroring.internal processor cache — An instruction and data cache built into the processor.IP — Internet Protocol.IPX — Internet package exchange.IRQ — Interrupt request. A signal that data is about to be sent to or received by aperipheral device travels by an IRQ line to the processor. Each peripheral connectionmust be assigned an IRQ number. Two devices can share the same IRQ assignment,but you cannot operate both devices simultaneously.jumper — Small blocks on a circuit board with two or more pins emerging from them.Plastic plugs containing a wire fit down over the pins. The wire connects the pins andcreates a circuit, providing a simple and reversible method of changing the circuitry ina board.K — Kilo-; 1000.Kb — Kilobit(s); 1024 bits.KB — Kilobyte(s); 1024 bytes.Kbps — Kilobit(s) per second.KBps — Kilobyte(s) per second.key combination — A command requiring you to press multiple keys at the same time(for example, ).kg — Kilogram(s); 1000 grams. |
