128megs on a CSA Derringer 030

[kolla]

4.) Yes, any machine with at least a 68020 has a 32bit data bus and at least 4 gigs of physical address space.

Carefull, it is not "at least 4 gigs", it is a theoretical maximum of 4 gibibytes of physical address space, and in reality less (some address is reserved to chipram for example). Oldsmobile here is very sensitive when it comes to this kind of information.