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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.
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