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AT&T 610 - Terminal Logic

AT&T 610
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Opera~ing
IDfOraa~ioD
Page
2-
2
The
terminal
is
capable
of
line
speeds
from
110
baud
through
19200
baud.
The
terminal
receives
data
through
a
500-
character
receive
buffer.
At
higher
line
speeds
(typically
greater
than
9600
baud)
the
receive
buffer
may
fill
up.
When
the
buffer
is
50
percent
full,
the
terminal
will
send
a
DC3
character
to
alert
the
host
of
a
possible
overrun.
As
the
buffer
empties
(to
10
percent
of
capacity)
the
terminal
will
generate
a
DC1
character
-
buffer
available.
Loss
of
data
may
occur
if
these
signals
are
ignored.
User's
Guide
Augus~
1985
The
terminal
operates
in
full
duplex
(FDX)
on
a
point-to-point
private
line
or
switched
network.
The
terminal
requires
the
use
of
Electronic
Industries
Association
(ELA)
data
source.
The
monitor
is
a
raster
scan,
monochrome,
short
persistence
green
Cathode Ray Tube
(CRT)
working
with
the
microprocessor
driven
controller
as
a
buffered
display
capable
of
connecting
to
point-to-point
or
switched
network
lines
or
in
a
direct
connect
arrangement.
White
(short
persistence)
and amber (medium
persistence)
CRTs
are
also
available.
The
terminal
firmware
is
an
integral
part
of
the
display.
Two
low
profile
keyboards
are
available,
one
with
98
keys
and
the
other
with
103
keys.
The
slope
of
the
keyboard
can
be
adjusted
by
extending
the
keyboard
feet.
With
the
feet
set
for
minimum
profile,
the
slope
is
5.
The
slope
then
goes
to
8
and
then
to
12
for
the
two
other
positions
of
the
feet.
The
keyboard
provides
tactile
feedback
and
can
be
optioned
to
provide
an
audible
"click"
when a
key
is
depressed.
The
keyboard
can
alert
the
operator
with
single
or
repeated
bell
tones.
The
keyboard
connects
to
the
terminal
through
a
coiled
cable
providing
keyboard
mobility
for
operator
convenience.
The
terminal
provides
an
ELA
RS-232-C
interface
to
connect
to
an
external
device.
This
interface
is
capable
of
speeds
of
110
to
19200
bits
per
second
(bps).
An
auxiliary
EIA
printer
may
be
connected
to
the
terminal
providing
for
hard
copy
of
data.
Terminal
Logic
The
controller
is
microprocessor-driven
with
Random
Access
Memory
(RAM)
and Read Only
Memory
(ROM)
for
the
firmware.
Nonvolatile
RAM
is
provided
for
preservation
of
options,
function
strings,
and
screen
labels
when power
is
removed.

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