Hi,
Just to let you know that after some more fun with the 6502 core, I made a KIM-1 emulator with it. It runs on a basic Arduino Uno, and can either be used through the serial port or with a small keyboard/LED display shield. It's a lot less useful then ehBasic, admittedly, but if it can be done it must be done 
A description and sources are here:
Regards,
Oscar.