Memory module

A small circuit board, commonly called a SIMM (single inline memory module), that contains surface-mounted memory chips. You can add memory modules to the main system board to expand your computer’s memory.

Microprocessor

A CPU chip, such as the 486SLC. See also CPU.

Numeric coprocessor

See Coprocessor.

Parallel

A way of organizing communications between two pieces of computer equipment, in which the signals that make up each character are sent simultaneously. See also Serial.

Power-on diagnostics

A set of testing routines the computer performs automatically every time you turn it on.

RAM

Random Access Memory. The portion of the computer’s memory that runs programs and temporarily stores data while you work. See also ROM.

Real-time clock

A battery-powered clock in the computer that keeps track of the current time and date even when the computer’s power is off.

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