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Host Adapter
A hardware printed circuit board that installs in a standard
microcomputer backplane and provides a SCSI bus connection so
that SCSI devices can be connected to the microcomputer. A host
adapter is intelligent if it has a simple high-level software inter-
face to the microcomputer. A host adapter is dumb if the micro-
computer must directly manage the SCSI protocol using the
microcomputer processor.
IBM PC-AT Compatible
Any computer system that emulates exactly the IBM PC-AT and
that uses an ISA backplane bus.
Industry Standard Architecture
The IBM PC-AT functions have been duplicated by a number of
manufacturers. All the IBM PC-AT compatible machines use a
backplane bus that very closely emulates the function of the back-
plane bus of the PC-AT. Because of the broad usage of this bus
structure, it has become known as the Industry Standard Archi-
tecture bus, even though there is no presently accepted standard
for the bus.
Initiator
A SCSI device that requests an operation to be performed by
another SCSI device (the target). The initiator provides all the
command information and parameters required to perform the
operation, but the details of the operation are actually sequenced
by the target.
ISA
See Industry Standard Architecture
Logical Unit
A physical or virtual device addressed through a target.
Logical Unit Number
An encoded three-bit identifier for a logical unit.
LU
See Logical Unit
LUN
See Logical Unit Number
EISA-to-Fast SCSI Host Adapter Glossary
GL-5