IBM Professional Series - Keyboard Usage

Keyboard Usage
If you have been using an IBM 3277 Display, you will notice
that the keyboard on your
IBM Personal Computer is not the
same as the keyboard
on your IBM 3277 Display.
The following picture shows you the physical layout of your
IBM Personal Computer XT/370 keyboard. The key tops
which are shaded have their functions changed when the
VM/PC application is running, that is, after the VMPC
command is entered.
4-2 VM/PC Users Guide