Test Mode - IBM 3278 Series Maintenance Information

w
en
~
t.I
.....
~
Q
0,
3.3.1.2 Test Mode 2
Test Mode 2:
Key-to-CRT
Test (used to
test the key-
board scan
codes)
Keyboard
Provides a path from keyboard to display.
Mode Entry: Automatic, after display is loaded
with Mode 1 pattern of characters_
Key in any characters (but do not press
..
Control key). _ _ _ _ _ _ _ _ _ _ _ _ _
..J
Characters keyed in replace characters displayed in Test
Mode 1, beginning at top left of display. This is a test of
keyboard scan codes.
Note:
Regardless of the characters that appear on the key-
tops, the characters displayed are those shown in the
diagram below. Notice that certain keys cause double-
character entry, the first when the key is pressed and
the second when it is released: these keys are labeled
nn, mm,
00,
and pp in the diagram .
0B88~~0~~8~~~~Rt988000
0B
B~~~~~~~P1~~~pjR
80 000
0 . .
8~
. .
~~
. . . . .
S . . . .
D8.~~~~.K.~ . .
R . .
·B~.n.0800B
00 @pj~0~0~~@RRH§~ 00 800
~~~trol ~E
SPACE _ _
JS~
For 87-Key
Keyboards
w
j.l
...
N
-I
1£
s:
8.
co
t.I