A peek at the development of the 286:

As far as the 286 is concerned, as of this date, nobody's even seen a fully functional one. The A-step samples out do not have the memory managment working yet and there are some pretty strange things happening with interrupts. And the darned thing won't run correctly with interrupts at 8 Mhz; you have to decrease the clock speed to about 7.5 Mhz. Intel's due to sample the B-step parts later on this month.