 Later, the clock frequency of microprocessor featured was increased.The Model 700 used the KA7AB CPU module containing a 133.33 MHz (7.5 ns cycle time) NVAX++, and the Model 800 used the KA7AC CPU module featuring a 170.9 MHz NVAX++.The CPU modules had two LEVI gate arrays which interfaced the microprocessor to the "Laser System Bus", the system bus.