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Take a look at this incredible piece of hardware... http://www.piengineering.com/custom/xkmatrix.php It is only $59 and will accept up to 128 switch inputs. Using the same proven hardware as the X-keys Programmable Keyboards, the X-keys Matrix Boards connect to the computer through a standard PS/2 or USB port. Your custom switches or keys connect to the board via a standard two row header with 0.1'' pin spacing. Programming is done with a standard keyboard and memorized commands are fed to your computer as if they were coming from a standard keyboard. Any sequence or combination of keystrokes may be assigned to any of the 96 (PS/2) or 128 (USB) possible switches in the matrix. Any switch, even toggle and rotary switches, can be connected to the matrix. Programming and reprogramming the switches is simple and fast. The X-keys stores scan codes in its internal memory -- it can be programmed on one computer and moved to another with its programming intact. -- ... http://www.zmix.net