I received the StowAway keyboard from Ao Loo. Already found the correct wiring and made a working driver. As I feared, it involved setting and resetting the handshake pins on the serial port. Fortunately, it was quite easy, I love the newton Communications architecture.
Now it's time to map the characters to each key and decide what functions to implement on those aditional keys the StowAway has. Ideas are welcome!

Two documents were added to the Newton Bowels project. About drawing directly to the screen framebuffer and getting the pen position on the screen.
Newton Bowels Project