The IBM family of APL systems
Adin D. Falkoff · IBM Systems Journal · 1991
The developmental history of IBM subfamilies of APL systems is traced in this paper, focusing on the inter-relationships among them and the methods of implementation used by the various groups involved. The language itself, and the way its evolution was managed, are also considered as factors influencing the development process. A chart is included that illustrates the evolution of mainframe and small machine programming products supporting APL, beginning in 1964 up to the present time.