Digital Equipment DEC 3000 Series Service Information page 403

bus
A group of signals consisting of transmission lines or
wires to create a common channel or pathway. The bus
interconnects either internal computer system components
to provide communications paths for addresses, data, and
control information or external terminals and systems in a
communications network.
byte
A group of eight contiguous binary digits (bits). Bits are
numbered from right to left, 0 through 7, with bit 0 being the
low-order bit. See also kilobyte and megabyte.
cable
A sheathed group of electrical conductors.
cable junction block
A small box attached to the monitor cable from which the BNC
connectors emerge.
cache
See cache memory.
cache memory
A small, high-speed area of memory placed between slower main
memory and the processor. Cache memory increases memory
transfer rates and processor speed. It contains copies of data
recently used by the processor and fetches several bytes of data
from memory in anticipation that the processor will access the
next sequential series of bytes.
caddy
The holder for an RRD42 compact disc.
CD
See compact disc.
CD-ROM
See compact disc read-only memory.
central processing unit (CPU)
The unit of the computer that is responsible for interpreting and
executing instructions.
channel
A path along which digital information can flow in a computer.
Also, the main current path between the source and drain
electrodes in a semiconductor device. See also bus.
Glossary–3