From the "Early Days" section: > PDP-11s still employed (efficient) 16-bit int most of the time, but could use 32-bit long as needed. The 32-bitters used 32-bi

From the "Early Days" section: > PDP-11s still employed (efficient) 16-bit int most of the time, but could use 32-bit long as needed. The 32-bitters used 32-bit int most of the time, which was more efficient, but could express 16-bit via short. Data structures used to communicate among machines avoided int. Oh, interesting. So "short" meant 16-bit portable integer, "long" meant 32-bit portable integer, and "int" meant fast non-portable integer.