Table of Contents
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Firmware
Hard Disk
Host
Host Adapter
Internal SCSI
Device
IRQ
ISA
Kbyte
Local Bus
Logical Unit
LUN
Mbyte
Mainboard
Main Memory
Software that is permanently stored in ROM. Therefore, it can be
accessed during boot time.
A disk made of metal and permanently sealed into a drive cartridge. A
hard disk can store very large amounts of information.
The computer system in which a SCSI host adapter is installed. It uses
the SCSI host adapter to transfer information to and from devices
attached to the SCSI bus.
A circuit board or integrated circuit that provides a SCSI bus connection
to the computer system.
A SCSI device installed inside the computer cabinet. These devices are
connected in a continuous chain using an unshielded ribbon cable.
Interrupt Request Channel. A path through which a device can get the
immediate attention of the computer's CPU. The PCI bus assigns an IRQ
path for each SCSI host adapter.
Industry Standard Architecture. A type of computer bus used in most
PCs. It allows devices to send and receive data up to 16-bits at a time.
Kilobyte. A measure of computer storage equal to 1024 bytes.
A way to connect peripherals directly to computer memory. It bypasses
the slower ISA and EISA buses. PCI is a local bus standard.
A subdivision, either logical or physical, of a SCSI device (actually the
place for the device on the SCSI bus). Most devices have only one logical
unit, but up to eight are allowed for each of the eight possible devices on
a SCSI bus.
Logical Unit Number. An identifier, zero to seven, for a logical unit.
Megabyte. A measure of computer storage equal to 1024 kilobytes.
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 adapters and other expansion boards.
The part of a computer's memory which is directly accessible by the CPU
(usually synonymous with RAM).
Glossary of Terms and Abbreviations
B-3
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