>On the other hand, there's no such thing as an external millicode call, so
>any new millicode would get bound into the program at link time, and would
>therefore be part of the program file. Compiling on 6.5 and then trying to
>LINK on an earlier version might be a problem, but (at least conceptually)
>I don't see a backwards compatibility issue arising just from the long long
>data type and it's associated millicode.
Du'oh! Absolutely correct!
Yeah, what he said!