PreScheme: https://en.m.wikipedia.org/wiki/PreScheme https://en.m.wikipedia.org/wiki/PreScheme Only C in one of the implementations was an I/O shim for the C-

PreScheme: https://en.m.wikipedia.org/wiki/PreScheme https://en.m.wikipedia.org/wiki/PreScheme Only C in one of the implementations was an I/O shim for the C-based OS. That could be removed for purity but they were about pragmatism.