Wiktionary
classical computer
n. (context computing English) A computer which is not a quantum computer, nor enjoys any other sort of (yet unknown) mechanism for transcending known computer science; a computer which can be modelled by a deterministic Turing machine
Usage examples of "classical computer".
In that situation a classical computer would have attempted to devote all of its time to high-priority operations, fitting in the lower ones whenever nothing more demanding needed attending to.