12 Glossary
P
page
A type of message transmission in which a message is sent or received via modem
to a paging device from a computer (with paging communications software) or
telephone.
parallel interface
Interface that communicates eight bits at a time.
parallel printer
A printer with a parallel interface.
parameter
A characteristic of a device or system determined by a command or setting whose
purpose is to define or limit the characteristic.
password
A string of characters that the user must enter before the system allows access or
system privileges.
PCI
Peripheral Component Interface/Interconnect. A self-configuring personal
computer local bus designed by Intel. Most modern PCs include a PCI bus in
addition to a more general ISA expansion bus. PCI is a 32-bit bus, but supports a
64-bit extension for new processors, such as the Pentium II. It can run at clock
speeds of 33 or 66 MHz. At 32 bits and 33 MHz, it yields a throughput rate of
133 megabits per second. 64-bit implementations running at 66 MHz provide
524 Mbps. See ISA.
peripheral
Input or output device not under direct computer control. A printer is a peripheral
device.
pixels
Picture elements. Tiny dots that make up a screen image. A pixel is the smallest
spot on the screen that a computer can address.
plug and play
Refers to the ability of a computer system to automatically configure expansion
boards and other devices. This enables a user to plug in a device and use it, without
worrying about setting DIP switches, jumpers, and other configuration elements.
port
Any connection by which data can enter or leave a computer or peripheral.
Provides the means for an interface between the microprocessor and external
devices. A cable connector is usually plugged into the port to attach the device to
the computer.
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