3x4 numpad/keypad problems! - Programmers Heaven

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3x4 numpad/keypad problems!

I am a student currently working on a combinational lock problem, using 68k assembly language. I have no idea how to use the numpad, or get numbers to 7 segment display, we need to scan the rows and columns of the numpad, then display the relevant number on a series of 7-segment displays. Any help that could be offered would be greatly appreciated.
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