Of course they would have usable skills - general understanding of computing, superb analytical minds, 36 years of advancement in education, excellent problem solving ability.

At most they would have to learn a new lexicon of programming languages and operating systems which are FAR less complicated than the current range of languages and design patterns software engineers must master today.

A few weeks (days?) of studying and figuring out how to pre-optimize for much smaller workloads and they'd be able to keep pace easily.