TYAN Thunder i7505 Manual page 37

IDE (Integrated Device/Drive Electronics): a simple, self-contained HDD interface. It can handle
drives up to 8.4 GB in size. Almost all IDEs sold now are in fact Enhanced IDEs (EIDEs), with
maximum capacity determined by the hardware controller.
IDE INT (IDE Interrupt): a hardware interrupt signal that goes to the IDE.
I/O (Input/Output): the conne ction between your computer and another piece of hardware
(mouse, keyboard, etc.)
IRQ (Interrupt Request): an electronic request that runs from a hardware device to the CPU. The
interrupt controller assigns priorities to incoming requests and delivers them to the CPU. It is
important that there is only one device hooked up to each IRQ line; doubling up devices on IRQ
lines can lock up your system. Plug -n-Play operating systems can take care of these details for
you.
Latency: the amount of time that one part of a system spends waiting for another part to catch up.
This occurs most commonly when the system sends data out to a peripheral device and has to
wait for the peripheral to spread (peripherals tend to be slower than onboard system components).
NVRAM: ROM and EEPROM are both examples of Non -Volatile RAM, memory that holds its data
without power. DRAM, in contrast, is volatile.
Parallel port: transmits the bits of a byte on eight different wires at the same time.
PCI (Peripheral Component Interconnec t): a 32 or 64-bit local bus (data pathway) which is
faster than the ISA bus. Local buses are those which operate within a single system (as opposed
to a network bus, which connects multiple systems).
PCI PIO (PCI Programmable Input/Output) modes: the data transfer modes used by IDE drives.
These modes use the CPU for data transfer (in contrast, DMA channels do not). PCI refers to the
type of bus used by these modes to communicate with the CPU.
PCI-t o-PCI bridge: allows you to connect multiple PCI devices onto one PCI slot.
Pipeline burst SRAM: a fast secondary cache. It is used as a secondary cache because SRAM
is slower than SDRAM, but usually larger. Data is cached first to the faster primary cache, and
then, when the primary cache is full, to the slow er secondary cache.
PnP (Plug-n-Play): a design standard that has become ascendant in the industry. Plug -n-Play
devices require little set-up to use. 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 withi n a client with 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 and
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: RAID I/O Steering (Intel)
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