DEC 4000 600 series Owner's Manual page 221

DRAM
Dynamic random-access memory. Read/write memory that must
be refreshed (read from or written to) periodically to maintain
the storage of information.
DSSI
Digital's proprietary data bus that uses the System
Communication Architecture (SCA) protocols for direct
host-to-storage communications.
DSSI VMScluster
A VMScluster system that uses the DSSI bus as the interconnect
between DSSI disks and systems.
EEPROM
Electrically erasable programmable read-only memory. A
memory device that can be byte-erased, written to, and read
from. Contrast with FEPROM.
environment variable
Global data structures that can be accessed from console mode.
The setting of these data structures determines how a system
powers up, boots operating system software, and operates.
Ethernet
A local area network that was originally developed by Xerox
Corporation and has become the IEEE 802.3 standard LAN.
Ethernet LANs use bus topology.
Ethernet ports
The connectors through which the Ethernet is connected to the
system.
Factory Installed Software (FIS)
Operating system software that is loaded into a system disk
during manufacture. On site, the FIS is bootstrapped in the
system, prompting a predefined menu of questions on the final
configuration.
Glossary–5