No, I was pretty sure you meant "theoretical" but I thought you might know of an open source project that could do it... The ideal project wouldn't have any graphics or user interface at all, just the calculations and data reading portions.. Something written in C or C++... Java would be bad. On a quick net search I saw a Java OBDII Sourceforge project but it had barely started and I don't know anyone who's going to want to port a Java program to C code that's efficient enough to run in the Empeg's tight memory and CPU requirements.

If we had to start from scratch I'd certainly think about contributing, but I'd need to see some very detailed specs.