Appendix
A-4
or an enterprise. It is made up of servers, workstations, shared resources, a
network operating system and a communications link. These individual PCs
and devices on a LAN are known as “nodes”, and are connected by cables to
access data and devices anywhere on the LAN, so that many users can share
expensive devices and data.
LED (light emitting diode)
A semiconductor device that converts electrical energy into light. Since it
lights up (usually red) when electricity is passed through it, it is usually used
for the activity lights on computer’s component, such as disk drivers.
LPT (line printer terminal)
Logical device name for a line printer; a name reserved by the MS-DOS for up
to three parallel printer ports: LPT1, LPT2, and LPT3. It is frequently used by
the OS to identify a printer.
PCI (Peripheral Component Interconnect)
A local bus standard developed by Intel that first appeared on PCs in late 1993.
PCI provides “plug and play” capability and allows IRQs to be shared. The
PCI controller can exchange data with the system's CPU either 32 bits or 64 bits
at a time.
PnP (Plug and Play)
A set of specifications that allows a PC to configure itself automatically to
work with peripherals. The user can "plug" in a peripheral device and "play" it
without configuring the system manually. To implement this useful feature,
both the BIOS that supports PnP and a PnP expansion card are required.
POST (Power On Self Test)
During booting up your system, the BIOS executes a series of diagnostic tests,
include checking the RAM, the keyboard, the disk drives, etc., to see if they
are properly connected and operating.
PS/2 Port
A type of port developed by IBM for connecting a mouse or keyboard to a PC.
The PS/2 port supports a mini DIN plug containing just 6 pins. Most modern
PCs equipped with PS/2 ports so that the special port can be used by another
device, such as a modem.
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