Questions about using the TAP-28 are best directed to various forums for the development language being used.
Jon is most active at Digital-DYI and on the Swordfish Forum.
To purchase TAP-28 boards, please use the Store page.
If you have questions relating specially to the TAP-28 board or projects presented here, please email Jon. Jon is also happy to hear about TAP-28 applications and would like to post them here.