DEC 4000 AXP Service Manual page 221

Futurebus+ Profile B
A profile is a specification that calls out a subset of functions from a larger
specification. Profile B satisfies the requirements for an I/O bus. See also
Futurebus+.
half-height device
Standard form factor for storage devices that are not the height of full-height
devices.
halt
The action of transferring control to the console program.
hard error
An error that has induced a nonrecoverable failure in a system.
hexword
Short for ''hexadecimalword.'' Thirty-two contiguous bytes (256 bits) starting on
an addressable byte boundary. Bits are numbered from right to left, 0 through
255.
I-cache
Instruction cache. A high-speed memory reserved for the storage of instructions.
Contrast with D-cache.
initialization
The sequence of steps that prepare the system to start. Initialization occurs after
a system has been powered up.
interleaving
See memory interleaving.
internal processor register (IPR)
A register internal to the CPU chip.
KN430 CPU
The CPU module used by DEC 4000 AXP Model 600 series systems. The KN430
CPU modeule is based on the DECchip 21064 microprocessor.
LAN (local area network)
A network that supports servers, PCs, printers, minicomputers, and mainframe
computers that are connected over limited distances.
Glossary–11