> I had, for some time, assumed that older 
> versions of OS/400 were essentially written in MI, and newer 
> versions in C++.  I guess that's approximately correct?

I would be inclined to say that the following is closer;

(a) Older versions in PL/MI (probably around 90% of OS/400)

(b) New functionality and major changed components in C++ (probably around 90% 
of (a) above)

There are 'stories' of complete re-writes of OS/400 into C++ but none of which 
I would fully believe. You only have to wonder around the system libraries to 
see that a few of the OS/400 programs are not from a C++ code base. 

PL/MI is very powerful and I would say easier to code with than 'pure' MI, it's 
kind of like CLP & MI welded together.


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