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The IBM 2740 and 2741 Communications Terminals
are operator-oriented data reading and communicat-
ing machines. The terminals enable the operator to
originate paper documents for local use, and to
transmit data to or receive data from another term-
inal in a rel.,ote office via communications facil ;ties.
IBM 2740 COMMUNICATION TER l\UNAL
This terminal combines the capabilities of the stand-
ard
mM
Selectric @typewriter with the flexibility
and speed of a printer-keyboard communication
terminal. Thus, this' dual-purpose unit can alter-
nately function as:
• A document writing unit in a normal typing oper-
ation.
• A data sending and receiving unit o\-er communi-
cation facilities, to another 2740 terminal (or
terminals), or to a computer (using a multiplexer).
The IBM 2740 Communications Terminal (Figure 1)
is a typing terminal which can be operated by any
typist with a minimum of additional training. The
major advantages of the basic Selectric are retained,
and added to these
i~
the flexibility provided
by
the
ability to communicate between remote locations.
Selectric features of the 2740 include stroke storage,
typamatic index key, interchangeable print elements,
and the compact ribbon cartridge.
The 2740 can be specified for anyone of three
types of operation: point-to-point (between two term-
Figure 1. IBM 2740 Communication Terminal
IBM 2740/2741 COMMUNICATION TERMINALS
inals), dial-up (between two terminals over a switched
network), or with a multiplexer (transmission control
unit).
The particular type of operation is specified
when the terminal is ordered.
The many applications of the 2740 include:
• Intracompany Communication
• Remote Inquiry and Reply with a Computer
• Intercompany Correspondence
• Executive Correspondence.
Special features are available for the 2740 to adapt
the terminal to a variety of applications. These in-
clude: dial-up adapter, transmit control, checking,
$tation control, automatic EOB, and IBM Line Adapt-
er (limited distance, leased line, or shared line). -
IRM 2741 COMMUNICATION TERMINAL
The IBM 2741 Communication Terminal (Figure 2) is
a remote input-output terminal providing direct ac-
cess to a computer (such as an IBM System/360)
through a multiplexer (such as an IBM 2701 Data
Adapter Unit, 2702 or 2703 Transmission Control
Unit, or an IBM 2712 Remote Multiplexer connected
to an IBM 2702 or 2703). Hereafter, these units will
be referred to as multiplexers for ease of reading.
The terminal is an IBl\J Selectric typewriter with the
added electronic controls necessary to enable it to
communicate with the computer.
It
is designed to
operate as a remote conversational terminal, entirely
dependent on specific computer programs. This
Figure 2. IBM-2741 Communication Terminal
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