IBM 3151 User Manual page 33

Step 3A. Changing the Key Caps (emulation)
a
This step describes how to change key caps to emulate the DEC VT220 keyboard.
Using the key-eap-removal tool, remove the key eaps shown
below (non-shaded).
Keep F6, F7, F8, F9, and FlO for the next step, and the other keys for possible
later use. Key caps that you change here must be returned to their original
positions before returning the keyboard to IBM.
Removal tool
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User's Guide for the Cartridge to Emulate IBM and DEC Terminals
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