Types of Operation
Compact Ribbon Cartridge. The ribbon cartridge
provides a clean and efficient approach to ribbon
changing. With this cartridge, ribbon changing con
sists of snapping one cartridge off and the new one on.
The entire process is accomplished in seconds.
Maximum Keying Efficiency. The terminal can
operate at speeds up to 14. 8 characters-per-second
(cps), however, the keying rate will vary depending
upon the speed of the operator. The keyboard is
designed to provide maximum keying efficiency and
throughput by retaining the basic Selectric type
writer features combined with easily accessible
communication controls (Figure 2).
The IBM 2740 Communication Terminal Model 1
can be specified for any one of three types of opera
tions: point-to-point, between two terminals or
terminal and multiplexer; dial-up, between two ter
minals or terminal and multiplexer over a switched
network; or station control, when two or more te r
minals and a multiplexer communicate over the
same non-switched line and the multiplexer (trans
mission control unit) is the master station. The
particular type of operation is specified when the
terminal is ordered, and thus a customized ter
minal is installed for one of the following types of
system operation.
Figure 2. 2740 Model 1 Keyboard (PTTC/BCD)
2
k.