Mediators do require Z3.
Now,the Mediator is actually the PCI-board with the lowest RL
transfer-rate,but even that is far to much for Zorro2.
Only chance of seeing PCI on an A2000 would be to have it connected
localy to the accelarator, but only the ancient A2630 and some GVP-boards
feature a connector that could be used for something like that. There is
also the rather small chance of getting the ColdFire-accel to work,
but that is something far in the future.