Phillip: I'm not sure if I'm getting this right... AT modes are rather software/OS driven. The motherboard integration may have or lack some of the ICs to fully exploit its capabilities, but again, I _THINK_ that's a problem for the sys. 286 Unixs and 286 OS/2 don't have a problem and I think they were written around the original AT. I might be missing your point. Like I said earlier, there are some features to OS/2 that are 386 dependent, but much of the code was written around that. Those, for the most part have to do with windowing and task management/slices. I was unaware the you could run Warp over the 286 but that seems masochistic. If it works, (well), I think IBM missed some good opportunity by not advertising those features. but then again, IBM wanted to sell OS and '386s.... -Mike Philip.Belben(a)powertech.co.uk wrote: