A digital processor which may be used in a calculator or the like is provided by an MOS/LSI semiconductor chip which contains a ROM or read-only-memory for storing instructions, a bit-parallel arithmetic unit for operating on data stored in a random access memory and control circuitry for defining the...http://www.google.de/patents/US4074355?utm_source=gb-gplus-sharePatent US4074355 - Digital microprocessor system with shared decode
