Most, if not all of introductory discrete math, logic gates, basic CPU logic, data structures* and algorithms can be mastered without a computer. Most (all?) C

Most, if not all of introductory discrete math, logic gates, basic CPU logic, data structures* and algorithms can be mastered without a computer. Most (all?) CS students learn this early on in university anyways, so it's natural to study if your friend is interested in computer science. He can also spend the time to master math, especially linear algebra. Getting a firm understanding on math never hurt any budding programmers and opens a ton of doors. * Once released, he can play with different DSs and experience their asymptotic performances for himself.