In a circuit arrangement wherein a memory matrix and an address decoder are constructed of read only memories (ROMs), a semiconductor read only memory is characterized in that at least the address decoder ROM in which the number of output lines to be selected is smaller than that of output lines not...http://www.google.com.hk/patents/US4240151?utm_source=gb-gplus-share專利 US4240151 - Semiconductor read only memory
