[bikenaga]

The Tandy 2000 used an 80186; I still have mine in the attic. It ran MSDOS 2.11, but it was not BIOS-compatible with the IBM PC (which explains why it was a market failure, even though it was technically superior in many ways). For example, you could mod it to have 896KB of base RAM (compared to the usual 640KB) - I had this done to mine. You could do this because video memory was mapped to a different location than with IBM PC's (but consequently, programs that wrote directly to video memory for speed wouldn't run unaltered on the 2000). I got tired of dealing with the incompatibilities and got a 286 from CompuAdd a couple of years later.