After the command CAPS has been issued, any input from the keyboard via INPUT, INKEY$ etc. is translated into capital letters. CAPS simulates the use of the capslock key.
To ask the user for any keyboard input, for example a
password where this should be entered in capital letters:
100 CAPS 110 INPUT "Please enter password:"!pass$ 120 NOCAPS
Some old replacement keyboards use dirty tricks to engage capslock. If you are fed up with the original QL keyboard then ensure you get the latest release of a modern keyboard interface and an IBM-style keyboard. If you do not do this, then you may have to change to capslock mode with CAPS…
NOCAPS is self-explanatory.