A powerful but simple editor based on APL

An experimental full screen editor has been written in APL for IBM 3270 display terminals, based on the following principles: • a small command repertoire, based on APL syntax. an undo facility for correcting mistakes. internal dependence upon a small number of editing primitives As written, the editor contains two major commands, thirteen minor commands, and permits all of APL for a macro language. The internal primitives are Erase, Insert Gap, Overlay and Find.