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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 e3000 line of computers.
In HP documentation and in talking with HP e3000 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 e3000s not based on the PA-RISC architecture. MPE V applications can be
run on PA-RISC (Series 900) HP e3000s in what is known as compatibility mode.
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