INTRODUCTION
The Texas Instruments Silent 700* Model763 memory
send/receivedata terminaland the Model765portable
memory data terminal are designed for easy, versatile
storage and communication of data. The memory
in
both models is implementedusing a revolutionary new
electromagnetic
bubble
memory device manufactured
by Texas Instruments. The Model 763 is a compact,
table-top data terminal designed for office use. The
Model 765 is a portable unit furnished with
an
attache-
case-like cover to make it useful wherever a standard
telephone and an electrical outlet are available. Both
models are capable of sending
and
receiving
information over long or short distances with equal
ease.
A memorydata terminal, usually referred to as an auto-
matic send/receive (ASR) dataterminal,
is
equippedto
store data in its memory (magnetic bubble, magnetic
tape, paper tape, diskettes, etc.) from its built-in key-
board or from a communications line (usually a tele-
phone line). The stored datais then availableforediting
(corrections, changes, deletions, additions to the re-
corded text), printing, and for transmission to other de-
vices at much higher speeds than manual keyboard
typing.
For storage of data, the Models
763/765
use the new
Texas
Ins~ruments
bubblememory, which has no mov-
ing parts and retains its stored information even with
power switched
off
(called nonvolatile memory). The
bubble memory offers important advantages overcom-
monly used paper tape, tape cassette, and diskette
memoriesused in otherdataterminals: Fasteraccessto
its stored data, smaller size, less weight, and lower
power consumption are only a few advantages
of
the
bubble memory in the Models 763/765 dataterminals.
Data Terminal Communications
A dataterminal generates codes. The Models 763/765
memory data terminals use the American Standard
Code for Information Interchange (ASCII), commonly
called "as-key",
orthe
equivalentC.C.I.T.T. codes. The
codes can
be
recorded in the 763/765 bubble memory
and/or
transmitted to, and understood by, other de-
vices. The Models 763/765 terminals also understand,
record, and print ASCII or C.C.I.T.T. codes from other
devices such as data terminals, computers, video ter-
minals, and dataloggers.
The code system consists of various combinations of
ones and zeros corresponding to numbers, alphabet
characters, control characters, or symbols. Combina-
DATA TERMINAL
Generates
and
und~rstands
CABLE
tionsofones and zeros are transmitted and received at
very high speeds as digital signals. The digital signals
areon and
off
signals; usuallya one is an onSignal, and
a zero is
an
offSignal. Forexample, the alphabet letter
"U"
isa series ofon
off
on
off
on
off
on (imagine flipping
a lightswitch on and off) or 101010
1.
How are the digital signals transmitted from one device
to another? Ifthedistanceisabout15meters(50feet)
or
less, cables are used to interconnect the devices and
the devices are referred to as hard wired together
(directly cabled). For example, when a data terminal is
connected to a computer for use
as
the computer con-
sole, it is usuallyhardwiredtothe computer.
EXTERNAL DEVICE
Understands
and
generates
Digital Signals Digital Signals Digital Signals
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ofTexas Instruments Incorporated
vi
