A microcode program sequencer includes first and second registers (herein designated the Q and P registers), each connected to a computer memory to receive addresses therefrom. Control means is provided for each register such that the P register will provide output addresses to a microcode memory, whereas...http://www.google.com.tw/patents/US4027293?utm_source=gb-gplus-share專利 US4027293 - Microcode program sequencer
