 Programs that ran without errors under the SP/k compilers produced the same results under other contemporary PL/I compilers such as IBM's PL/I F compiler, IBM's checkout compiler or Cornell University's PL/C compiler.Other examples are PL0 by P. Grouse at the University of New South Wales, PLUM by Marvin Zelkowitz at the University of Maryland., and PLUTO from the University of Toronto.In a major revamp of PL/I, IBM Santa Teresa in California launched an entirely new compiler in 1992.