Hi If you want to take a stab at building a native version for AMD64 architectures (or, in fact, any other 64-bit architecture), try the updated source code at: http://rcdrummond.net/uae/test/20050618/ I've fixed a bunch of 64-bit-related problems. It compiles and runs here on AMD64 now, anyway. So, let me know how it goes for you. Note there are non AMD64-specific optimizations in the code and the JIT won't currently work there either, so performance won't be great. Cheers, Rich