pascal-p5
5th version of the Pascal-P compiler
...The source for the original compiler was passed around and modified quite a bit, but Niklaus Wirth noted that it was very popular, and represented a good method to popularize the language. He gathered the source into a clean version called Pascal-P2. The Zurich group then created an improved version called Pascal-P4.
You can find all of the Pascal-P versions here in sourceforge:
https://sourceforge.net/projects/pascal-s/
https://sourceforge.net/projects/pascal-p2/
https://sourceforge.net/projects/pascalp4/
https://sourceforge.net/projects/pascalp5/
https://sourceforge.net/projects/pascal-p6/