Numeric Keypad - IBM Personal Computer AT Manual To Operations

Numeric Keypad
Pressing the Numeric Lock (Num Lock) key once
switches the cursor keys to number keys and the shift
keys work in reverse. The keypad is arranged like a
calculator to save time when typing many numbers.
Pressing Num Lock again returns keys 0 through 9 to
cursor control keys.
The numeric lock light comes on when you press the
Num Lock key or when your program is in the number
lock mode. The light goes off when you press the Num
Lock Key again, or your program is no longer in the
number lock mode.
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1-8 Keyboard