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Microprocessor
See CPU.
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.
Read Only Memory. The portion of the computer’s memory
that contains permanent instructions and cannot be modified.
Unlike RAM, ROM retains its contents even after you turn off
the computer. See also RAM.
RS-232C
A standard serial interface. The computer has a connector that
lets you attach an RS-232C-compatible device to your computer.
Glossary 3