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ARM 7 LPC 2148 + Keyboard (numeric)

Hello,

I bought numeric keyboard, likely matrix keyboard.
I have 3 solutions: 1. Sold numeric likely matrix. 2. Use PS/2 port to usb, and connect with Arm. 3. Connect keyboard with originally usb port to Arm.
ps. Please recomended me second or third solution. And where I can find code for this.

Thank you in advance