Closing some gas in my understanding: How did the 68000 do complex mathematical calculations? Obviously both the Mac and Lisa had spreadsheet and graphics/CAD-type applications prior to the 68020 & 30. Did the software simply use the CPU to pull double duty? If so, then I guess the answer is s-l-o-w-l-y. In which case a Mac Plus, SE & Classic would have been unable to use later software which required an FPU ... would software FPU emulators run on a 68000?