QMR
Q22–bus Map Register
QNA
Q22–bus Ethernet controller module
RAM
Random Access Memory
RIP
Restart In Progress flag in CPMBX<3>
RPB
Restart Parameter Block is a software data structure used as a
communication mechanism between firmware and the operating
system. Information in this block is used by the firmware to
attempt an operating system (warm) restart.
SCB
System Control Block is a data structure pointed to by PR$_
SCBB. It contains a list of longword exception and interrupt
vectors.
SGEC
Second Generation Ethernet Chip
SDD
Symptom-Directed Diagnosis. Online analysis of nonfatal system
errors in order to locate potential system fatal errors before they
occur.
SHAC
Single Host Adapter Chip
SP
Stack Pointer or R14
SRM
Standard Reference Manual, as in
VAX SRM
SSC
System Support Chip
µs
Microsecond (10e-6 seconds)
VAXcluster
configuration
A highly integrated organization of VMS systems that
communicate over a high-speed communications path.
VAXcluster configurations have all the functions of single-
node systems, plus the ability to share CPU resources, queues,
and disk storage. Like a single-node system, the VAXcluster
configuration provides a single security and management
environment. Member nodes can share the same operating
environment or serve specialized needs.
VMB
Virtual Memory Boot is the portion of the firmware dedicated to
booting the operating system.
Glossary–4