Can someone help with this? I need to interface a 4x4 matrix keypad to a basicx and output this as 8-bit BCD. Also is there a way...

Can someone help with this? I need to interface a 4x4 matrix keypad to a basicx and output this as 8-bit BCD. Also is there a way to do key mapping? At present Im using a Fairchild keypad decoder IC or this project but the problem is it wont allow me to assign the rows and colums