<1. The AT had been deliberately set up so that it couldn't make one of
<the transitions between modes - IBM were being paranoid and thinking of
<crackers having a back door - but this "feature" was removed in the
Incorrect. the I286 has real and protected modes and intel for some
wacky reason gave you a way to go from real to protected but not back.
The only way to get to real mode agan was...reset!
<2. Intel had a fault on a large batch of 286s that couldn't do some of
<the things you'd expect. IBM bought a job lot on the cheap and stuck
<them in XT286s.
Nope, xt286 was a way to put a cheap system of slightly higher performance
out there using slower parts.