Introduction
This chapter
is
provided for experienced operators
of
the
IBM
3275 and 3277
Display Stations who will be operating an
IBM
3278 Display Station attached
to
a
3274
Control Unit or to a 3276 Control Unit Display Station. The two
groups
of
machines are similar in operation, and only the differences in opera-
tion are described here. This chapter refers
you
to sections
of
Chapters
2,
3,
and 4 for detailed descriptions
of
some
of
the 3278 indicators, switches,
features, and keyboard operations.
If
your
3278
is
not attached
to
a 3274
Control
Unit or to a 3276 Control Unit Display Station, there may be differ-
ences other than those described here. Refer
to
the appropriate appendix for
a description
of
those differences.
If
possible, sit
at
a 3278 display as
you
read this chapter so
that
you
can use
the switches and keys
as
you read about them.
If
your
display station has a
keyboard attached and
if
some point
is
not
clear
as
you
read, pause for a
moment to press the key and watch the result.
The
IBM
3278 Display Station
is
shown in Figure 5-1. The 3278 (like a
3277) communicates with the host system through a control unit.
Figure 5-1.
IBM
3278 Display Station
Chapter 5. Differences between the 3275/3277 and the 3278
5-3
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