The keyman64 is a programmable keyboard interceptor and hardware control system for computers equipped with a simple 64-key matrix keyboard.
It is installed between the keyboard and the computer, continually scanning the keyboard matrix and relaying the keyboard state to the computer using a crosspoint switch. To the computer, the crosspoint switch matrix looks just like a physical keyboard, while the keyman64 gains the ability to intercept keystrokes and control the matrix seen by the computer.