A computer system is provided which is compatible with existing programmable option select systems and which provides optional enhanced system setup capabilities. The enhanced system permits use of application software designed specifically for existing programmable option select systems which utilize...http://www.google.com.hk/patents/US5138706?utm_source=gb-gplus-share專利 US5138706 - Password protected enhancement configuration register for addressing an increased number of adapter circuit boards with target machine emulation capabilities
