The basic sequence was: - Rewrite B compiler in B (generating threaded code) - Extend B to a language Ritchie called NB (new B). This compiler generated PDP a

The basic sequence was: - Rewrite B compiler in B (generating threaded code) - Extend B to a language Ritchie called NB (new B). This compiler generated PDP assembly There is no version of the NB compiler known to exist. - Continue extending NB until it became the very early versions of C. You can read the longer version of this history here: https://www.bell-labs.com/usr/dmr/www/chist.html https://www.bell-labs.com/usr/dmr/www/chist.html