Question: The 56-pin version of the FX2 would be great in a product, but the fact the serial ports aren't brought out causes concerns about whether firmware can be debugged. Does anyone make an emulator?
Not for the 56-pin package. However, for Keil debugger support, the choice would be to prototype with 100-pin or 128-pin packages. Then, after ensuring design quality, scale down to the 56-pin package for production.