1. Bartee, T. Digital Computer Fundamentals, 3rd ed., New York, McGraw-Hill, Inc., 1972. 2
2. Boone, G. Computing System CPU, United States Patent 3,757,306 filed August 31, 1971, and issued September 4, 1973. 3
3. Boone, G. Variable Function Programmable Calculator, United States Patent 4,074,351 filed February 24, 1977 and issued February 15, 1978. 3
4. MCS 85 User's Manual, Intel Corporation, 1977. 3
5. MSP Low-Power Microcontrollers, (SLAB034AD), Texas Instruments, 2017. 5, 6, 7