HP 3000 Manuals

Getting Started as an MPE/iX Programmer Programmer's Guide

Use of MPE/iX Optimizer with Languages 

In MPE/iX Native Mode, HP C/iX, HP COBOL II/XL, HP FORTRAN 77/iX, and HP
Pascal/iX provide the optimizer option.  Currently, HP COBOL II/XL
provides only Levels 0 and 1.  HP C/iX, HP Pascal/iX, and HP FORTRAN
77/iX provide Levels 0, 1, and 2.

MPE/iX 5.0 Documentation