If I was to get one of the Vampire boards for my A500, I would want it to be compatible with all the software that runs on the A500!
I would also like to benefit from getting 50fps in 3D games like Gunship 2000, Frontier, Wing Commander, etc. In this scenario, disabling the FPGA isn't an option. However for other games, it is. I would also not like to reboot to switch between FPGA and native 68k, but that might be asking too much!
But people are definitely looking in the future to buy FPGA Amigas to replace broken Amigas, and to run their existing software, and benefit from faster performance (if only to play Alien Breed 3D II at full frame rates).
If implementing an existing 68k MMU model is too difficult in an FPGA due to whatever factors, and in 90% of cases using a new model that does work well isn't a problem (handled by the OS), then maybe the issue is getting the remaining MMU-using software patched. This is just a matter of time, and people have been waiting a long time already, so what's the problem here really?
Also, IMO, the admins should split this topic into two threads - "FPGA 68k Design Considerations" and "Testing Vampire on the A500/A600"
