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Epson Endeavor User Manual

Page 179

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Option card

A circuit board you can install inside the computer to provide

additional capabilities, such as a modem or an additional I/O

port. Option cards plug directly into the special option slots so

you do not have to alter a computer’s circuitry to enhance your

system. See also Bus.

OS/2

Operating System/2. The enhanced operating system

developed jointly by Microsoft and IBM that provides

protected mode processing and multitasking capabilities. See

also DOS, MS-DOS, and Operating system.

Over Drive processor

An optional microprocessor chip that doubles the internal

processing speed of the microprocessor and includes a built-in

math coprocessor.

Parallel

The type of interface that transmits all the bits in a byte of data

simultaneously over separate wires in a cable. See also Interface

and Serial.

Parameter

A qualifier added to a command that tells your operating

system what data to process, where it should locate or store a

file, or how it should operate. See also Switch.

Parity

A method used to verify the accuracy of data transmissions by

making the total of the number of l’s in a group of bits odd

(odd parity), even (even parity), or none (no parity).

16 Glossary