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data cache
A high-speed cache memory reserved for the storage of data. Abbreviated as
D-cache.
DECchip 21064 processor
The CMOS, single-chip processor based on the Alpha architecture and used on
many AlphaGeneration computers.
DEC OSF/1 Version 3.0b for AXP systems
A general-purpose operating system based on the Open Software Foundation
OSF/1 2.0 technology. DEC OSF/1 V3.x runs on the range of AlphaGeneration
systems, from workstations to servers.
DEC VET
Digital DEC Verifier and Exerciser Tool. A multipurpose system diagnostic tool
that performs exerciser-oriented maintenance testing.
diagnostic program
A program that is used to find and correct problems with a computer system.
direct-mapping cache
A cache organization in which only one address comparison is needed to locate
any data in the cache, because any block of main memory data can be placed in
only one possible position in the cache.
direct memory access (DMA)
Access to memory by an I/O device that does not require processor intervention.
DRAM
Dynamic random-access memory. Read/write memory that must be refreshed
(read from or written to) periodically to maintain the storage of information.
DSSI
Digital’s proprietary data bus that uses the System Communication Architecture
(SCA) protocols for direct host-to-storage communications.
DSSI cluster
A cluster system that uses the DSSI bus as the interconnect between DSSI disks
and systems.
Glossary–5
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