The extra PCB is for the Teensy3 with RPI interface. The reason that I gave it out as a freebie is that if you even are not interested in the Teensy3, you may be able to use it next month as a fixture for a small application that I hope you may be interested. I should include a note, sorry for wasting your time. I will learn from this.
I will support the Pi-Duino-BB. Gerber files will be posted once it's finalized. Everyone can make it, but I am not interested in making it. I was thinking to sell it for $9 to help some users get up and running faster, but later changed my mind and would prefer to give it away for free, because I don't have enough free time in the near future.
The schematic and docs will be posted next week. I have a project deadline on June 14, sorry that I couldn't do it sooner.
Back to the SB-BB, Gerber files will be posted once it's finalized. I won't trade mark the SB, anyone can use it and make boards. If you want to sell boards please state clearly that they are not made by Firebirduino.
I discovered that many users on this forum still prefer through hole products, I will remove the FT231XS and replace it with a 6-pin FTDI connector on the next revision.
I will remove the 328P out of the SB, the 328P is not needed on a 1284P board if there is a demand for the 1284P. I feel there is a demand for the 1284P, thanks for the core refresh by Jack and others.
The original pin file developed by Roger Schaefer may have issues, but I ran some programs including DFrobot LCD and it was fine. Apparently it did not pass a more advanced test, like Bill's graphic LCD libraries.
Bill, thanks for the corrections.
Wayne