26. Data: (1) A representation offacts, concepts or instructions in a
formalized manner suitable for communication, interpretation,
or processing by humans or automatic means. (2) Any repre-
sentations such
as
characters
or
analog quantities to which
meaning is, or might be assigned.
27. Din Connectors: One
of
the connectors specified by the
Din
standardization committee.
28. DIP:
"Dual
In-Line Package." A widely used container for an
integrated circuit.
DIP's
are pins usually in two parallel rows.
These pins are spaced on
1/10"
inters and come in different
configurations ranging from a 14-pin assembly to a 40-pin
configuration.
29. Display: A visual presentation
of
data.
30. DMA: Direct Memory Access.
31. DO-D7:
Data
Bits 0 to 7. (Refer to System Board
I/O
Channel
Descriptions
).
32.
DRQI-DRQ3:
DMA
Request 1 to
3.
(Refer to System Board
I/O
Channel Descriptions).
33. DSR:
Data
Set Ready, associated with modem control.
34. DTR: Distribution Tape Reel.
35. Edge Connector: An opening which joins with the end
of
a
circuit board. The purpose
of
this interface
is
to send electrical
signals back and forth.
36.
EIA/CCITT
Drives: Electronic Industries Association/
Consultative Committee on International Telegraphy and
Telephony Drives.
EPROM
or 'PROM': Tern1 for "Programmable Read-Only
Memory." An
EPROM
or
'PROM'
is
actually Read-Only
Memory (ROM) but the contents may be changed by electrical
means.
EPROM
or
'PROM'
information
is
not destroyed when
the power
is
cut
off.
37. Firmware: Memory chips with the software programs already
built in.
38. Graphics: Symbols Produced by a process such
as
handwriting,
drawing or printing. Synonymous with graphic symbol.
39. Hexadecimal: Pertaining to a selection, choice, or condition
that has sixteen possible values or states. These values or states
usually contain 10 digits and six letters A through F. Hexa-
decimal digits are equivalent to a power
of
16.
G-3
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