IBM 3164 ASCII Manual page 86

c. Press and hold the Ctrl key; then press the Del Ln key.
d. The key ID and the shift condition of the Del Ln key will be displayed
on the far right. Check this value with the value on page 4-18.
L:93 L U:93 L
c:
93 C
Step 3. Press Change Keys. The CHANGE KEYS menu will appear.
Step 4. Press and hold the Ctrl key; then press Change Keys to return to
normal operation.
You have completed checking the current setting of the Del Ln key.
4-27