Found 2 records for the .PL1 file extension name
There are 1 other file type using the PL1 file extension:
.pl1 - 3D Home Architect room plan
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.file extension PL1 - PL/1 programming language source file
File extension PL1 description:
PL/1 was developed as an IBM product in the mid 1960's, and was originally named NPL (New Programming Language). The name was changed to PL/1 to avoid confusion of NPL with the National Physical Laboratory in England. If the compiler had been developed outside of the United Kingdom, the name may have remained PL/1.
Until the time this new language was developed, all previous languages had focused on one particluar area of application, such as science, artificial intelligence, or business. PL/1 was not designed to be used in the same way. It was the first large-s cale attempt to design a language that could be used in a variety of application areas.