Hi, If any one needs S-100 Serial IO and S-100 EPROM/RAM PCBs to restore their S-100 system or even build their own from scratch please contact me. There is more information here: http://s100computers.com/My%20System%20Pages/Serial%20IO%20Board/Serial%20I… http://s100computers.com/My%20System%20Pages/PROM%20Board/PROM%20Board.htm There are plenty of each PCB left although the S-100 EPROM/RAM boards are starting to get low. Thanks and have a nice day! Andrew Lynch