Dell PowerEdge 1600SC User Manual

Page 32

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h

 

Abbreviation for hexadecimal. A base-16 numbering system, often used in programming to identify addresses in the system's RAM and I/O memory addresses

for devices. The sequence of decimal numbers from 0 through 16, for example, is expressed in hexadecimal notation as 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E,
F, 10. In text, hexadecimal numbers are often followed by h.

 

heat sink

 

A metal plate with metal pegs or ribs that help dissipate heat. Most microprocessors include a heat sink.

 

host adapter

 

A host adapter implements communication between the system's bus and the controller for a peripheral device. (Hard drive controller subsystems include

integrated host adapter circuitry.) To add a SCSI expansion bus to your system, you must install or connect the appropriate host adapter.

 

Hz

 

Abbreviation for hertz.

 

ICES

 

Abbreviation for Interface-Causing Equipment Standard (in Canada).

 

ID

 

Abbreviation for identification.

 

IDE

 

Abbreviation for integrated drive electronics.

 

I/O

 

Abbreviation for input/output. A keyboard is an input device, and a printer is an output device. In general, I/O activity can be differentiated from computational

activity. For example, when a program sends a document to the printer, it is engaging in output activity; when the program sorts a list of terms, it is engaging
in computational activity.

 

interlacing

 

A technique for increasing video resolution by only updating alternate horizontal lines on the screen. Because interlacing can result in noticeable screen flicker,

most users prefer noninterlaced video adapter resolutions.

 

interleaving

 

A technique for storing data more efficiently by arranging parts of one sequence of data so they alternate with parts of another sequence of the same data.

When the data is retrieved, the system puts the sequence back together again.

 

internal microprocessor cache

 

An instruction and data cache built in to the microprocessor. The Intel Pentium microprocessor includes a 16-KB internal cache, which is set up as an 8-KB

read-only instruction cache and an 8-KB read/write data cache.

 

IPX

 

Acronym for internetwork packet exchange.

 

IRQ

 

Abbreviation for interrupt request. A signal that data is about to be sent to or received by a peripheral device travels by an IRQ line to the microprocessor.

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