Shift Keys; Capitals (Caps) Lock Key - IBM RT PC Manual To Operations

Shift Keys
TNL SN20-9870 (May 1987) to 75X0178
There are two Shift keys on the keyboard. Pressing either of the Shift keys
switches the letter keys from lowercase to uppercase and the numeric keys
in the typewriter key area from numbers to symbols. Pressing the Shift key
switches the numeric and period keys in the numeric keypad from line
drawing characters to numbers and a period. The Shift key temporarily
reverses the state of the capitals lock mode and the numeric lock mode.
Pressing the Shift key in capitals lock mode switches the letter keys from
uppercase to lowercase. Pressing the Shift key in numeric lock mode
switches the numeric and period keys in the numeric keypad to line drawing
characters.
Capitals (Caps) Lock Key
The Capitals (Caps) Lock light comes on when you press the Caps Lock key
and the keyboard is now in capitals lock mode. The light lets you know that
the A through Z keys are locked in uppercase. The light goes off when you
press the Caps Lock key again, and your program is no longer in capitals
lock mode. The capitals lock mode cannot be used to type the symbols that
appear on the tops of other keys. Pressing either of the Shift keys
temporarily switches the letter keys from uppercase to lowercase when you
are in capitals lock mode.
Section 2. Using the Keyboard and Mouse 2-9