HP SCSI Host Bus Adapters FCC, LVD, See, host, Random, memory, device, device, erasable, (EEPROM), firmware, read-only, Fast SCSI, hard disk, with RAM), mainboard, Low Voltage

E
electronically	A memory chip typically used to store configuration information. See Non-Volatile Random
erasable	Access Memory (NVRAM).
programmable
read-only
memory
(EEPROM)
external SCSI	A SCSI device installed outside the computer cabinet. External SCSI devices are connected in
device	a chain using shielded cables.
F
Fast SCSI	A standard for SCSI data transfers. It allows a transfer rate of up to 10 MBytes/sec over an 8-bit
	SCSI bus, and up to 20 MBytes/sec over a 16-bit SCSI bus.
FCC	Federal Communications Commission.
firmware	Software that is permanently stored in ROM. In the case of PDC, it can be accessed during boot
	time without the aid of an operating or file system.
H
hard disk	A rigid disk permanently sealed into a drive cartridge. A hard disk can store very large amounts
	of information.
host	The computer system in which a SCSI host bus adapter is installed. It uses the SCSI host bus
	adapter to transfer information to and from devices attached to the SCSI bus.
host bus adapter	A circuit board and/or integrated circuit device that provides a SCSI bus connection to the
	computer system.
I
internal SCSI	A SCSI device installed inside the computer cabinet. These devices are connected in a chain
device	using an unshielded ribbon cable.
interrupt request	A path through which a device can get the immediate attention of the computer’s CPU. The
channel (IRQ)	PCI bus assigns an IRQ path for each SCSI host bus adapter.
K
KByte (kilobyte)	A measure of computer storage equal to 1024 bytes.
L
logical unit	A subdivision, either logical or physical, of a SCSI device. Most devices have only one logical
	unit, but up to sixteen are allowed for a 16-bit SCSI bus and eight for an 8-bit SCSI bus.
logical unit	An encoded three-bit number for the logical unit.
number (LUN)
Low Voltage	A robust design methodology that improves power consumption, data integrity, cable lengths,
Differential	and support for multiple devices while providing a migration path for increased I/O
	sperformance.
LVD	See Low Voltage Differential.
M
main memory	The part of a computer’s memory that is directly accessible by the CPU (usually synonymous
	with RAM).
mainboard	A large circuit board that holds RAM, ROM, the microprocessor, custom integrated circuits,
	and other components that make a computer work. It also has expansion slots for host bus
	adapters and other plug-in boards.

78 Glossary