Service manual

<REFERENCE>(XMA2)
XMI memory array; a memory subsystem of the XMI. Memory is a global
resource equally accessible by all processors on the <REFERENCE>(XMI).
A memory module can have 32, 64, or 128 Mbytes of memory, consisting of
MOS 1–Mbit or MOS 4–Mbit dynamic RAMs, ECC logic, and control logic.
Node
An <REFERENCE>(XMI) node is a single module that occupies one of the
14 logical and physical slots on the <REFERENCE>(XMI) bus. A VAXBI
node consists of one or more VAXBI modules that form a single functional
unit.
Node ID
A hexadecimal number that identifies the node location. On the
<REFERENCE>(XMI) bus, the node ID is the same as the physical location.
On the VAXBI, the source of the node ID is an ID plug attached to the
backplane.
Pended bus
A bus protocol in which the transfer of command/address and the transfer
of data are separate operations. The <REFERENCE>(XMI) bus is a pended
bus.
Primary processor
See Boot processor.
Processor node
A VAX processor that contains a central processor unit (CPU), executes
instructions, and manipulates data contained in memory.
RBD
ROM-based diagnostics.
RBV20/RBV64
VAXBI adapter for write-once-read-many (WORM) optical disk drive. The
RBV20 and RBV64 controllers use the KLESI–B adapter.
Scalar/vector processor pair
The FV64A vector processor functions as a coprocessor with a host scalar
processor. The scalar/vector processor pair appear as one processor to an
executing program.
Secured terminal
Console terminal in program mode while the machine is processing.
Glossary–4