Native mode is the normal processing
mode of the MPE XL operating system. Native mode applications are
those that have been compiled into the native instruction set of
the HP 3000 Series 900 computer.
Compatibility mode is a processing
mode on HP 3000 Series 900 computers that allows MPE V applications
to run on MPE XL machines without changes or recompilation.
Applications in native mode run faster than applications in compatibility
mode. If you are running SNA IMF/XL, use the native mode SNA IMF
intrinsic calls, and compile your SNA IMF applications in native
mode for better performance.
Native mode intrinsic calls differ from compatibility mode
intrinsic calls only in BASIC and COBOL. In FORTRAN, SPL, Pascal,
and C, native mode intrinsic calls are identical to compatibility
mode intrinsic calls.
In COBOL, native mode intrinsic calls differ from compatibility
mode intrinsic calls in two ways:
The name of the intrinsic in a compatibility
mode intrinsic call begins with a "C" for COBOL.
The names of intrinsics in native mode have no initial "C."
The word "INTRINSIC" appears in
every COBOL intrinsic call in native mode. Compatibility mode intrinsic
calls do not contain the word "INTRINSIC."
In BASIC, native mode intrinsic calls differ from compatibility
mode intrinsic calls in only one way: The name of the intrinsic
in a compatibility mode intrinsic call begins with a "B" for
BASIC. The names of intrinsics in native mode have no initial "B."
The "Summary of Intrinsic Calls," at the
end of Chapter 3 “Intrinsics Used with Standard MPE
I/O” lists all the intrinsic calls
for native mode and compatibility mode.
For information on migrating applications from compatibility
mode to native mode, see the Migration Process Guide and Introduction
to MPE XL for MPE V Programmers: Skills Migration
Guide.
