Tyan Computer TOLEDO S5520 - Manual (Page 75)

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PM timers (Power Management timers): software timers that count down the
number of seconds or minutes until the system times out and enters sleep, suspend,
or doze mode.
PnP (Plug-n-Play): a design standard that has become ascendant in the industry.
Plug-n-Play devices require little set-up to use. Novice end users can simply plug
them into a computer that is running on a Plug-n-Play aware operating system
(such as Windows 98), and go to work. Devices and operating systems that are not
Plug-n-Play require you to reconfigure your system each time you add or change
any part of your hardware.
PXE (Preboot Execution Environment): one of four components that together
make up the Wired for Management 2.0 baseline specification. PXE was designed
to define a standard set of preboot protocol services within a client, towards the goal
of allowing networked-based booting to boot using industry standard protocols.
RAID (Redundant Array of Independent Disks): a way for the same data to be
stored in different places on many hard drives. By using this method, the data is
stored redundantly, also the multiple hard drives will appear as a single drive to the
operating system. RAID level 0 is known as striping, where data is striped (or
overlapped) across multiple hard drives, but offers no fault-tolerance. RAID level 1
is known as mirroring, which stores the data within at least two hard drives, but
does not stripe. RAID level 1 also allows for faster access time and fault-tolerance,
since either hard drive can be read at the same time. RAID level 0+1 is both striping
and mirroring, providing fault-tolerance, striping, and faster access all at the same
time.
RAIDIOS: stands for RAID I/O Steering, a type of RAID technology from Intel.
RAIDIOS is a specification used to enable an embedded I/O controller, embedded
on the motherboard, to be used as just an I/O controller or to be the I/O component
of a hardware RAID subsystem. The RAIDIOS circuit allows an I/O Processor
(either embedded on the motherboard or on an add-in card) to configure the I/O
controller and service the I/O controller’s interrupts. The I/O controller and the I/O
Processor together are two of the primary components of a hardware RAID
subsystem.
RAM (Random Access Memory): technically refers to a type of memory where
any byte can be accessed without touching the adjacent data, is often used to refer
to the system’s main memory. This memory is available to any program running on
the computer.
ROM (Read-Only Memory): a storage chip which contains the BIOS; the basic
instructions required to boot the computer and start up the operating system.
SATA (Serial ATA): is an evolutionary replacement for the Parallel ATA physical
storage interface. Serial ATA is a drop-in solution in that it is compatible with today’s
software and operating systems. It will provide for systems which are easier to