Processor board

A special, upgradable circuit board connected to the main system board containing the microprocessor, cache memory, and a socket for a math coprocessor.

Processor speed

See Operating speed.

RAM

Random Access Memory. The portion of the computer’s memory used to run programs and store data while you work. All data stored in RAM is erased when you turn off or reset the computer; so you must store all your data on disk.

Read/write head

The physical device inside a disk drive that reads data from and records data on the magnetic surface of a disk.

Real-time clock

A battery-powered clock inside the computer that keeps track of the time and date, even when the computer is turned off.

Reset

To reload a computer’s operating system so you can retry a task or begin using a different operating system. Resetting erases all information in RAM.

RGB

Red Green Blue. A type of color monitor.

14 Glossary