Own a Piece of History: Seize the opportunity to own a piece of computing history with the Imp-16 National Semiconductor Processor. One of the most rare processors. Whether you\'re a seasoned collector or a tech aficionado, this rare find is sure to elevate your collection to new heights.The National Semiconductor IMP-16 is a family of 16-bit microprocessors that was released in 1973 and was the first multi-chip microprocessor with this number. It was made up of five PMOS integrated circuits, including four RALU chips and one CROM. The RALU chips provide the data path, while the CROM provides microcode storage and control sequencing