The Numeric Keypad - IBM Personal Computer XT Manual To Operations

The Numeric Keypad
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Pressing the Numeric Lock key once places keys.0
through 9 of the numeric keypad in the numeric state.
Then when keys.0 through 9 are pressed, numbers
appear on the screen. Pressing NumLock again returns
keys.0 through 9 to cursor-control keys.
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Scroll
Lock
Break
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The purpose of the Scroll Lock key is defined in your
operating system manual or application program
manual.
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Pressing the Insert key enables you to add characters in
the middle of a line. Press it again and you're back to
normal operation.
3-10 Keyboard