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IBM 3278 Series

IBM 3278 Series
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3.3.1.1 Test Mode 1
DISPLAY
STATION
TEST
•
Tests
3278
Display
Station
offline
from
the
control
unit
.
•
Does
not
test
coax driver/receiver
and
display features;
they
may
be
tested
with online
test
0 (refer
to
3.3.2.2l.
Test Name
Jlctivity
Result
Test Mode 1:
Displays a
predetermined
pattern
of
characters.
F
ills display with
pattern
of
characters
shown
in
Figure
Pattern
Display
3-1, 3-2,
or
3-3.
Compare
th
e
test
pattern
lines
shown
in
the
figure with
the
corresponding
lines
on
the
Mode
Entry:
Set
Aa/A
to
Aa.
screen. Verify
that
the
characters
are in
correct
Set
Normal/Test
to
Test.
sequence.
This is a
test
of
the
character generator, storage,
and
control logic. Character-generator failure causes
wrong
or
defective characters
to
be displayed
at
any
point
or
points
on
the
screen,
and
control
failure
affects
all
characters.
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