IBM 3270 Manual page 32

Most of the typewriter keys you will use work
like the keys on a typewriter. Some of the keys
that have more than one use are shown with:
• Markings on the front side (alternate case)
• Markings in different colors (the black and
the blue)
Others act as toggle switches (press once to
turn on the function, press again to turn it
off)
How to use these keys is explained in the next
sections.
Using Upper and Lower Case
Most keys have an upper and lower case. The
letters A through Z, the numbers 1 through 0,
and the special symbols have upper and lower
case. These work like the keys on a typewriter.
For lower case, press the key by itself.
I
#:...---+---
Upper Case
3 ......
---1---
Lower Case
\
For upper case, press and hold the Shift key and
then press the key you want.
Using Keyboard/Control Program 3-3