SECTION 1
FUNCTIONAL DESCRIPTION
The
620
is
a desk-top
stand-alone
alphanumeric CRT
display.
It
has
a 780-
character
programmable
memory
and
the optional capability of writing into
anyone
of
over
2,000
screen
locations. Optional edit
features
include Horizontal and
Vertical
tabs,
fixed and
variable
data
blocks, and conversation mode. All
I/O,
editing,
memory,
display
and power supply components
are
self-contained in a single
terminal
package.
It
is
designed to
operate
in a
remote
environment
via
data
set
modem connection to a digital
Central
Processor.
The
620
keyboard contains alphanumeric and· control function keys
as
defined by
Appendix C. Data
entry
via
the
keyboard
causes
screen
character
generation
or
function
control to
occur
simultaneously with each
keystroke.
Hardcopy may be added to the 620 with the
use
of
the hardcopy adapter and a
tele-
printer.
The
remote
user
may
initiate
the copy
of
either
variable
block information
or
the
entire
screen
content by
depressing
the function keys
associated
with those
operations.
The computer may poll and
initiate
a
printing
sequence by
inserting
a
print
command
instruction
prior
to the ETX of
its
outbound
message.
Data
transmission
may be on a polled
Or
a contention
basis
and can be
either
synchronous
or
asynchronous. A
subset
of Standard USASCn Code
is
used
for
all
data
transmission
and the data
set
interconnection
meets
EIA
standard
RS
232
B Specifications.
1
