The definitive guide to this system is Pascal Implementation: The P4 Compiler and Interpreter by Steven Pemberton and Martin Daniels. It provides the complete, documented source code for both the compiler and interpreter.
Run the pint interpreter, providing the prr file as input to execute the program. Key Resources and Documentation
P4 served as the foundation for several major Pascal implementations, most notably the UCSD p-System . Pascal Implementation: A Book and Sources - CWI
Compile pcom.p and pint.p using an existing Pascal compiler.