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:
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
Thanks and have a nice day!