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There is MULTICS, which was released as open source a while ago, and an emulator was written for it also. Since MULTICS had a high quality PL/I compiler, you c

There is MULTICS, which was released as open source a while ago, and an emulator was written for it also. Since MULTICS had a high quality PL/I compiler, you can install the emulator to play with the language. The "shell" is different from Unix but shares some similarities. About 3/4 of the way down this page, is the PL/I source code: https://multicians.org/pl1.html https://multicians.org/pl1.html

dfawcus 1y ago
There is also a CP/M PL/I compiler, and apparently also CPM-86 and DOS versions. Simply because some of the source file (1 or 2) for CPM are written in PL/1, rather than the majority having been written in PL/M, then eventually translated to assembler. Here we go: http://www.cpm.z80.de/binary.html http://www.cpm.z80.de/binary.html PLI-80 BINARY : 146K This is the PLI compiler. It is very compatible with the IBM PLI compiler used on the 360. The only functions I found missing were DATE and TIME, which were easy to fake out. (Apparently this is version 1.0). PLI-80 version 1.3 : 111K Here is the PLI-80 version 1.3 compiler and libraries. PL/I-80 version 1.4: 188K - version 1.4 including quite a few example files