DEC 3000 800, Owner'S Manual

Page: 302 / 318

SCSI
See Small Computer System Interface.
SCSI bus
A communications pathway between the Small Computer System
Interface (SCSI) and other internal devices. The SCSI bus
consists of an address bus, which selects the location of the data,
and a data bus, which transfers the data.
SCSI controller
The device that directs the operations of the Small Computer
System Interface (SCSI) with synchronous and asynchronous
capabilities.
SCSI jumpers
Removable electrical connectors on some of the drives, such
as the RRD42, that determine the SCSI ID setting on a drive.
Each installed drive must have a unique setting for proper
communication between the system and all drives.
SCSI switches
Electrical switches on the side or back of some drives, such
as the RX26, that determine the SCSI ID setting of the drive.
Each installed drive must have a unique setting for proper
communication between the system and all drives.
secondary cache
A cache that resides in the system between the processor’s
primary cache and the system memory. Compare with primary
cache.
segment
A length of 10BASE2 Ethernet cable made up of one or more
cable sections connected with barrel connectors or T-connectors.
self-test
A test that is invoked automatically when the system starts up.
Glossary–28