When I learned to write FORTRAN IV for the CDC 6400 in 1974, I was told the standard compiler was written as a single routine. Didn't see the code myself, sadl

When I learned to write FORTRAN IV for the CDC 6400 in 1974, I was told the standard compiler was written as a single routine. Didn't see the code myself, sadly. My, how our knowledge of how to do things has changed!