"C J Campbell" writes:

It would be interesting to know why you think Win NT would be
unstable on something like the MX-20.

As a user of 1966 aviation technology, I look at "stability" over
a longer term than a few hours.

Manufacturers who use proprietary software like NT give up control
of their products. In the short term, that means that they might
not be able to make required changes in a timely manner. In the
long term, it means that a very expensive piece of equipment could
become a paperweight, or at least much less useful than it could
be, at the whim of a third party (MS).

The risk of those things happening is, I hope, fairly low, but I
still prefer to deal with a company that takes more control of its
product when investing such a large (to me) amount.

--kyler