HP 3000 Manuals HP 3000 Manuals
Compatibility Mode Versus Native Mode
HP FORTRAN 77/V programs can be run on MPE/iX in compatibility mode or
native mode. As discussed in Chapter 1, FORTRAN 77/V object code can be
directly transferred to an MPE/iX based system with no changes to the
source code; these programs can then be run on an MPE/iX system under
compatibility mode. Although it is a fast way to move programs from one
system to the other, migrating to compatibility mode does not take full
advantage of the higher performance of the 900 Series HP 3000 computer
and the MPE/iX operating system.
An alternate method is to convert the FORTRAN 77/V source code to HP
FORTRAN 77/iX source code, compile it with the HP FORTRAN 77/iX compiler,
and run the compiled code on the MPE/iX system in native mode. Programs
run in native mode are usually much faster and more efficient than those
run in compatibility mode.
Migrating to compatibility mode was explained in Chapter 1
("Introduction"). Migrating to native mode is explained in the rest of
this manual.