IBM 3278 Series Maintenance Information page 113

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Test Pattern Definition
CCCC identifies the control unit (3274 or 3276)
to which the 3278 is attached.
NN is the port number (00 through 31).
?SEL PEN and SEL PEN are high-intensity,
protected, and selector-pen-detectable fields.
&SEL PEN and> SEL PEN are normal-
intensity, protected, and selector-pen-
detectable fields .
Non-display field with NON preceding
normal-intensity and protected field DISPLA Y
INSERT. If blanking circuits on analog
card fail, NON can be seen .
CK (and two null characters) is normal-intensity,
unprotected, and non-detectable field, followed
by another normal-intensity, unprotected, and
non-detectable field containing cursor.
Test Pattern
(Line 1)
TEST: CCCC NN
(Line 2)
?SEL PEN
(Line 3)
&SEL PEN
(Line 4)
DISPLAY
SEL PEN
> SEL PEN
INSERTCK
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