 The first XAP processor was XAP1, designed in 1994 and used for a number of wireless and sensor ASIC projects at Cambridge Consultants.It was a very small, 3,000-gate, Harvard architecture, 16-bit processor with a 16-bit data bus and an 18-bit instruction bus intended for running programs stored in on-chip read-only memory or ROM.Data and instructions were each addressed by separate 16-bit address bus.