MPE/iX Intrinsics Reference Manual (32650-90875)

13
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 .