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Glossary 711
pixel
A single point on a video display. Pixels are arranged in rows and columns to create
an image. A video resolution, such as 640 x 480, is expressed as the number of
pixels across by the number of pixels up and down.
PLCC
Acronym for plastic leaded chip carrier.
Plug and Play
An industry-standard specification that makes it easier to add hardware devices
to personal computers. Plug and Play provides automatic installation and
configuration, compatibility with existing hardware, and dynamic support of
mobile computing environments.
PME
Abbreviation for Power Management Event. A PME is a pin on a peripheral
component interconnect that allows a PCI device to assert a wake event.
POST
Acronym for power-on self-test. Before the operating system loads when you turn
on your computer, the POST tests various system components such as RAM, the
disk drives, and the keyboard.
power supply
An electrical system that converts AC current from the wall outlet into the DC
currents required by the computer circuitry. The power supply in a
personal computer typically generates multiple voltages.
power unit
A set of power supplies in a system chassis.
ppm
Abbreviation for pages per minute.
PQFP
Abbreviation for plastic quad flat pack, a type of microprocessor socket in which
the microprocessor chip is permanently mounted.
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