search for computer interface at like google, u can pick up a empty pcb board that fits in a pci slot where u can use the bus, if your not confortable with that u can always build one that run off the printer port, their are 8 io's 4 address and like 4 input i think, u can rig up the 4 address to switch where the 8 io's go giving you 32 lines(in its most bassic form), if you know VB search for, canada ioport, in google and download that ocx, it controls the printer port, make a prog ur set