>>6Early C compilers were not efficient. C originally didn't do any optimizations (see arguments about i++ vs ++i) and hardware was different. Unix was originally written in assembly and rewritten in C in 1973. Unix was not ported from the PDP-11 until 1977. Writing an OS in a high-level language was not a new idea anymore. C became important later, in the 1980s, because of Sun, which created the first Unix workstation, and Windows. That explains the huge gap between C's creation and standardization.