An APL microprogramming structure
Stanley M. Nissen, Steven J. Wallach · 1973
Several papers have been published (Ref. 1, 2, 3) which describe an APL machine. The APL machines by Zaks, et al and Hassitt, et al, describe a microprogrammed approach which uses pre-existing microinstruction formats and machine capabilities. No special hardware was added to enhance the execution of APL statements.