...The second compiler is an extension of the first that includes a Common Sub-Expression optimizer. XPL was used to write the HAL/S compiler for NASA about the same time this XPL compiler was being developed but this is not the compiler used to create HAL/S.
I am in need of technical documentation for the Modcomp Classic and the MAX IV operating system. Please let me know in the discussion section is you have documentation from Modular Computer Systems.