> To be fair, Switcher had limitations due to memory and no hardware multitasking support in the original 68000.

Ahem, the Amiga would like a word...

The 68000 hardware could support preemptive multitasking just fine; what it lacked was a hardware MMU. You couldn't run an OS with protected virtual memory on a 68000 without external hardware support (sometimes another 68000 was used for this!). Accordingly, all tasks on the Amiga had access to each other's memory space and even the kernel's. But the fact that Switcher, MultiFinder, and later versions of Mac OS could only support cooperative multitasking was more a Mac OS limitation than a hardware one.