Service manual

Shadow set
Two disks functioning as one disk, each shadowing the information
contained on the other, controlled by an HSC controller under the VMS
operating system.
Symmetric multiprocessing
A multiprocessing system configuration in which all processors have equal
access to operating system code residing in shared memory and can perform
all, or almost all, system tasks.
System root
In a BOOT commmand, the argument to the /R5 qualifier.
TBK70
VAXBI adapter connecting the TK tape drive to the system.
TU81E
VAXBI adapter for a local (nonclustered) tape subsystem. The TU81E
controller uses the KLESI–B adapter.
VAX Diagnostic Supervisor (VAX/DS)
Software that loads and runs diagnostic and utility programs.
VAXBI bus
The 32-bit bus used for I/O.
VAXBI Corner
The portion of a VAXBI module that connects to the backplane and provides
an electrically identical interface for every VAXBI node.
VMB
The virtual memory boot program (VMB.EXE) that boots the operating
system. VMB is the primary bootstrap program and is stored on the boot
device. The goal of booting is to read VMB from the boot device and load
the operating system.
XBI
Lines in the self-test display that show the status of <REFERENCE>(XBI_
plus) adapters and of VAXBI nodes. See also <REFERENCE>(xbi_plus).
XMI
The 64-bit, high-speed system bus.
Glossary–5