3276/78
Emulation Mode
The
following
eight
models of
the
3276
are
available:
• Models 1
and
11 provide a 960-character display
• Models 2
and
12 provide a 1920-character display
• Models 3
and
13 provide a 2560-character display
• Models 4
and
14 provide a 3440-character display
Besides
the
noted differences
in
display sizes,
the
models
are
separated
by
their
standard
line
protocols. Models 1
through
4 support
Binary
Synchronous Communications (BSC),
whereas
models 11
through
14
support
Synchronous
Data
Link
Control
(SDLC).
An
optional
SDLCIBSC Switch allows models 1-4 to function
with
either
line protocol.
The 3278 Display
Station
is available
in
5 models
varying
in
character
display sizes from 960
characters (Model
1)
to 3654
characters
(Model 5). Models 2, 3,
and
4
have
the
same size
displays
as
the
corresponding model
number
of
the
3276. When
the
3278
attaches
to a 3276,
the
display
character
capacity of
the
3278 cannot exceed
the
display capacity of
the
3276.
The 3276 Control
Unit
offers support for
the
IBM 3287
and
IBM 3289
printers.
HP'S EMULATION OF THE 3276/78
With
the
optional
integral
printer
installed,
the
HP
2625A
can
function
as
all
three
basic
components of
the
3270 Information Display System.
As
the
HP
2625A operates
with
BSC protocol
and
supports screen sizes of 1920, 2560,
and
3440 characters,
it
appears
to a host application program
as
a model
2,
3, or 4 of
the
3276.
Different cabling
requirements
established by IBM
and
HP
prevent
you, however, from
connecting a 3278 Display
Station
or
an
IBM
printer
to your
terminal.
However, you
may
daisy-chain
up
to 31 additional
HP
2625A's from
the
first 2625A
terminal
within
a modem
drop line.
USING YOUR TERMINAL IN AN IBM ENVIRONMENT
In
ffiM applications,
your
terminal
operates
as
an
IBM 3276 Control Unit/3278 Display
Station.
It
connects to a
host
computer
through
a remote bisynchronous connection. There-
fore,
the
HP
2625A matches
the
performance ofa remote 3276.
It
cannot
duplicate
the
speed
of
a channel
attached
control
unit.
For
a group of terminals,
the
first
HP
2625A
must
be
connected to a modem (or modem bypass cable). Subsequent
terminals
connect to
the
first
in
daisy-chain fashion.
Host Operating Systems
The host computer
may
be
running
with
one
of
the
following access methods:
•
Virtual
Telecommunications Access Method
(VTAM)
• Basic Telecommunications Access Method
(BTAM)
• Telecommunications Access Method (TCAM)
The
Advanced
Telecommunication
Function
(ACF)
versions
are
supported
for VTAM
(ACFIVTAM)
and
for TCAM (ACTITCAM).
F-3
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