MPE/iX System Utilities Reference Manual (32650-90908)

17
Preface
MPE/iX, Multiprogramming Executive with Integrated POSIX, is the latest in a series of forward-compatible
operating systems for the HP 3000 line of computers.
In HP documentation and in talking with HP 3000 users, you will encounter references to MPE XL, the direct
predecessor of MPE/iX. MPE/iX is a superset of MPE XL. All programs written for MPE XL will run without
change under MPE/iX. You can continue to use MPE XL system documentation, although it may not refer to
features added to the operating system to support POSIX (for example, hierarchical directories).
Finally, you may encounter references to MPE V, which is the operating system for HP 3000s, not based on
PA-RISC architecture. MPE V software can be run on the PA-RISC (Series 900) HP 3000s in what is known
as compatibility mode.