This article is from the MachTen & CodeBuilder FAQ, by Jaime Julca firstname.lastname@example.org with numerous contributions by others.
On 68030 and 68040 machines, Professional MachTen takes over the memory
management hardware to provide demand-paged virtual memory and memory
Power MachTen does not yet support UNIX virtual memory nor memory
protection. Tenon originally designed Power MachTen to take advantage of
Copland's protected threads. Apple's next-generation OS quickly became a
moving target. Talk of Copland eventually became talk of BeOS, and now with
the NeXT acquisition, Rhapsody is on the horizon. At this time, Tenon does
not plan to implement UNIX VM for Power MachTen. This could change depending
on market demand.
Power MachTen can, of course, be used with MacOS VM or RAMDoubler.