Since the Freakduino Chibi runs on the internal oscillator, there is a problem with serial input at the higher speed > 100K. I was able to get a single character recognized, but the second one wasn't. For example I type a single A into the Arduino serial monitor and hit enter; it works fine. I type AA and hit enter, the first character is fine, the second is something other than A.
It works fine at the slower speeds and I can send a whole sentence without problems.
Actually the problem is also still visible with an external crystal if you use 115200 bps. For those speeds, you would need an exact divider like 7.3728 MHz or 11.059 MHz. The boards work well with the internal oscillator and a UART at 250 kbps which is the speed used for DMX, but that's because there's 0% error with 8 MHz.
Thank you. I may just up it to 250 to see how well my laptop handles that speed. I don't really need input to the board at that high a speed, but it's really nice to be able to get it out that fast. I use the input to choose which address out of a list I want to listen to, so a single character works fine for now.