An electronic digital processor system including an internal memory, an arithmetic and logic unit, registers, peripheral control circuitry providing an internal mode, an external mode, emulator mode, data paths, and control and timing circuitry. In the internal mode, the data and the commands are stored...http://www.google.com.hk/patents/US4441154?utm_source=gb-gplus-share專利 US4441154 - Self-emulator microcomputer
