Hi! There are bunch of S-100 Serial IO boards left so if anyone would like one or more please let me know. John has a nice description of the board here: http://s100computers.com/My%20System%20Pages/Serial%20IO%20Board/Serial%20IO %20Board.htm These are respin PCBs which resolve all the minor issues from the original release and the board is 100% without any modifications. These are generic IEEE-696/S-100 serial IO boards with dual serial ports, optional USB, and optional voice synthesizer support. There are also some parallel pins available. They are available for $20 each plus $3 shipping in the US and $6 elsewhere. If you have questions you can contact me or ask on the mailing list http://groups.google.com/group/n8vem-s100 Thanks and have a nice day! Andrew Lynch PS, although these are home brew PCBs you can use them in either building your own S-100 from scratch, restoring/repairing a vintage system, just adding them to an already working system for more IO.