PL/M originally ran on large PDP-10 mainframe computers that would output the final machine language code on punch tape which would then be fed into an programmable ROM burner and then the ROMs would be transferred to the target machine.
PL/M (Wikipedia)PL/M, an acronym for Programming Language for Microcomputers, is a high-level language conceived and developed by Gary Kildall in 1973 for Hank Smith at Intel for the Intel 8008. It was later expanded for the newer Intel 8080.