Just to let anyone who is interested know that i've started a project to create Amiga accelerators starting with the most basic one i could think of ... an A500 68020 accelerator.. A video of the first prototype running is on my channel "terriblefire"
https://youtu.be/QqDn7l8Fia0
Everything is up on github but the UCF file is currently for the patched rev1.
https://github.com/terriblefire/tf520
I am about to do an assembly video for the rev2. I havent managed to get 16Mhz running stable yet.
https://github.com/terriblefire/tf520
After i have verified it works you can order the bare PCB at :-
http://dirtypcbs.com/view.php?share=...300398d2ff0048
(of course you can just grab the Gerbers and order them from the board house of your choice... but this link is particularly cheap and i get $1 per *order* (i.e. 10cents per board) which helps me keep developing prototypes). I'm not doing this for profit. I just think a lot of people want to make hardware for the Amiga and we should start standing on each others shoulders to make progress.
I'm also designing the 030 + FPU version and that will be going to the board house in time for Xmas.