Glossary
EISA - Extended Industry Standard Architecture. An extension of the
External SCSI Device - A SCSI device installed outside the computer cabinet. These devices are connected in a continuous chain using specific types of shielded cables.
Fast SCSI - A standard for SCSI data transfers. It allows a transfer rate of up to 10 Mbytes/s over an
FCC - Federal Communications Commission.
File - A named collection of information stored on a disk.
Firmware - Software that is permanently stored in ROM. Therefore, it can be accessed during boot time.
Hard Disk - A disk made of metal and 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 adapter is installed. It uses the SCSI host adapter to transfer information to and from devices attached to the SCSI bus.
Host Adapter - A circuit board or integrated circuit that provides a SCSI bus connection to the computer system.
Internal SCSI Device - A SCSI device installed inside the computer cabinet. These devices are connected in a continuous chain using an unshielded ribbon cable.
IRQ - 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.
ISA - Industry Standard Architecture. A type of computer bus used in most PC’s. It allows devices to send and receive data up to
Kbyte - Kilobyte. A measure of computer storage equal to 1024 bytes.
Local Bus - A way to connect peripherals directly to computer memory. It bypasses the slower ISA and EISA busses. PCI is a local bus standard.
Logical Unit - 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.
LUN - Logical Unit Number. An identifier, zero to seven, for a logical unit.
LVD -
Mbyte - Megabyte. A measure of computer storage equal to 1024 kilobytes.
Main Memory - The part of a computer’s memory which is directly accessible by the CPU (usually synonymous with RAM).
Motherboard (Mainboard ) - A large circuit board that holds RAM, ROM, the microproces- sor, custom integrated circuits, and other components that make a computer work. It also has expansion slots for host adapters and other expansion boards.
32 | Glossary |
|
|