PL/M Source Code File
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What is a PLM file?
A PLM file is a source code file written in PL/M (Programming Language for Microcomputers), a high-level programming language for Intel 8-bit microcomputers. It contains declarations and statements separated by semicolons that are compiled by a PL/M compiler into machine code that can be run by a microcomputer.
PL/M was developed by Gary Kildall in the early 1970s for Intel 8-bit microprocessors, such as the 8008, 8080, 8085, 8086, and 80186. The language was also used in Zilog Z80 based systems during the 1970s and 1980s.
PL/M is no longer supported by Intel but there are several programs still available that can compile the language to microcomputer machine code or translate it to C source code.