Abstract: A microprocessor comprises an internal address bus having a first portion (2,4) having a plurality of conductors carrying the low order address byte and a second portion (10) having a plurality of conductors for carrying the high order address byte. The microprocessor further comprises a plurality of registers, including an incrementor (12,13), a program counter (14,15), a temporary register (16,17), a stack pointer (18,19), an index register (20,21), and an accumulator (22,24), each comprising a pair of 8-bit registers for temporarily storing information. An arithmetic logic unit (28) performs computational operations on digital information within the microprocessor. The microprocessor includes a pair of internal data buses (6,8) each having a plurality of conductors for conducting digital information within the microprocessor. Means are provided for coupling selected ones of the registers, or the high or low order portions thereof, to the first and second data buses.