IBM 847651U Handbook - Page 339
read-only memory ROM, random access memory RAM
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doped silicon, and that when energized produce a flow of positive charge carriers (holes). prompt. A visual or audible message sent by a program to request the user's response. (T) POST. Power-on self-test. PUN. Physical unit number. power-on self-test (POST). A series of diagnostic tests that are run automatically by a device when the power is turned on. processing. The performance of logical operations and calculations on data, including temporary retention of data in microprocessor storage while the data is being operated on. processing unit. (1) A functional unit that consists of one or more processors and their internal storages. (I) (A) (2) See processor. processor. A functional unit that interprets and executes instructions. A processor consists of at least an instruction control unit and an arithmetic and logic unit. (T) See microprocessor and central processing unit. program. (1) A sequence of instructions that a computer can interpret and execute. (2) To design, write, modify, and test computer programs. (I) (A) programmable read-only memory (PROM). A storage device that, after being written to once, becomes read-only memory. (T) (A) R RAID. Redundant array of independent disks. RAM. Random access memory. random access memory (RAM). (1) A storage device in which data can be written and read. (2) A storage device into which data is written and from which data is read in a nonsequential manner. RAS. Reliability, availability, and serviceability. read. To acquire or interpret data from a storage device, from a data medium, or from another source. read-only memory (ROM). Memory in which stored data cannot be modified by the user except under special conditions. See also EEPROM, EPROM, and PROM. record. (1) A set of data treated as a unit. (2) A set of one or more related data items grouped for processing. refresh. (1) To recharge a memory location in volatile memory with an electric current so that it retains a state or binary value. (2) In computer graphics, the process of repeatedly producing a display Glossary 305
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