Glossary
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PSU See power supply unit.
RAM Random access memory, also known as user or
program memory, which stores programs and
data loaded from disk ready for processing.
real-time clock
(RTC)
A clock inside a computer which keeps time
whether the computer is switched on or off.
reboot See reset.
refresh rate The number of times per second the graphics
adapter sends an image to the monitor.
reset Clear the memory of a computer and reload the
operating system usually done by pressing the
reset button.
ROM Read-only memory. This type of memory can
only be read from.
screen mode The format (including resolution and number of
colours) in which information is presented on the
screen.
serial interface An interface which transmits or receives signals
one piece at a time.
serial number The unique number assigned to a computer (or a
component); on RM computers, the serial
number is on the rear of the computer e.g.
M012345678.
server A computer which controls the activities of a
network.
SIMM/DIMM Single Inline Memory Module/Dual Inline Memory
Module; A small plug-in board containing DRAM
chips. SIMMs provide your computer's memory.
software Programs such as operating systems,
applications or languages.
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