IPL

Information Processing Language

Allen Newell, J. C. Shaw, H. Simon, Carnegie about 1956

Said to be the first list-processing language, also the first language to support recursion. Very low level.

Information Processing Language-V Manual, Rand Corp, Allen Newell ed, Prentice-Hall, 1964.

IPL-I

Never implemented.

IPL-II

1957, for JOHNNIAC.

IPL-III

Existed briefly.

IPL-IV

IPL-V

1958, for the IBM 650, 704, 7090, and many others. Widely used.

IPL-VI

Designed to be implemented as an interpreted language with microcode support. 1959