TI86's can emulate ti85 and ti82's perfectly with the assembly shell ASE or Rascall, so why cant it emulate TI-83's? Also, is the motorola 68000 chip used in the Ti89 powerful enough to emulate Z80? If it will emulate Ti86 at over 90% speed, I will definately buy one, but if it cant emulate Z80 then I wont bother.