Majsta started his Vampire project on the A500 but chose to move to the A600 for the first production version as it was historically under served by accelerators. With expertise in A600 accelerators gained by Majsta and the Phoenix/Apollo team it made sense to stick with the A600 for the Vampire 2/Apollo development. The Apollo team had their own A500 "sandwich" accelerator design but rapid progress with the Vampire has seen that become the focus.
