DEC 3000 800, Owner'S Manual

Page: 286 / 318

distributed processing
A processing configuration in which each processor has its own
autonomous operating environment. In a distributed processing
environment, the processors are not tightly coupled and globally
controlled as they are with multiprocessing. Instead, an
application is distributed over more than one system. The
application must therefore have the ability to coordinate its
activity over a dispersed operating environment.
DMA
See direct memory access.
DRAM
See dynamic random-access memory.
drive plate
A removable section of the system unit on which you can mount
one removable-media drive, such as a compact disc, and two
3½-inch fixed drives, such as the RZ family of drives.
dynamic random-access memory (DRAM)
Read/write memory that must be refreshed (read from or written
to) periodically to maintain the storage of information.
ECC
See error correction code.
ECC error
A memory error of two possible types: an ECC correctable error
is usually a single-bit error that can be successfully detected and
corrected by the system; an ECC uncorrectable error is usually a
multiple-bit error that can be detected but not corrected by the
system.
EEPROM
Electrically-erasable programmable read-only memory. A
programmable read-only memory whose individual calls can be
erased by using electrical signals instead of ultraviolet (uV) light.
Contrast with FEPROM.
Glossary–12