Page "IBM PL/S" Paragraph 6

PL / S was succeeded by PL / S II and PL / AS ( Programming Language / Advanced Systems ), and then PL / X ( Programming Language / Cross Systems ).

PL / DS ( Programming Language / Distributed Systems ) was a closely related language used to develop the DPPX operating system, and PL / DS II was a port of the S / 370 architecture for the DPPX / 370 port.