Typamatic Keys; Shift/Lock Keys - IBM 3270 Operator's Manual

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Typewriter Keyboard
Typamatic Keys
SHIFT/LOCK Keys
Some of the keys, like some of those on electric typewriters, are
called typamatic keys. This means that they have the ability to
repeat their character or their function automatically if held
down. The keys that have this capability are shown in Figure 10.
Figure 10. The typamatic keys increase your operating speed.
The discussion of each key also mentions the typamatic
capability if it applies.
The SHI FT and LOCK keys are the same as on a standard
typewriter keyboard. When either the left or the right SH 1FT
key is pressed, the upper symbols shown on the dual character
keys will display when their respective keys are pressed. If the
character key has no upper symbol (such as the Alphabet keys),
the SH I FT key has no effect. The SH I FT keys are nonlocking
and must be held down.
Pressing the LOCK key electronically locks the keyboard in a
shifted (uppercase) condition. When the LOCK key is used, you
don't have to hold the SH I FT key down, and both hands are free
for typing. Press either SHI FT key when you are ready to return
the keyboard to the unshifted (lowercase) condition. This
releases the electronic lock.