Re: The problem probably wasn't the software...
There would probably be data problems.
The VAX format for floating point numbers, both single and double precision, differs from the now customary IEEE standard. SUN wrote a software library with a name resembling "external data representation" or something like that, to ease data transfers from old Vax computers to new Sun ones. It also converted between big-end and little-end binary integers, 16-bit or 32-bit.
If suitable data records are defined, Vax data can be transferred over networks to Sun or Intel machines.