HP 3000 Manuals

Accessing Files Programmer's Guide

Chapter 11  Accessing a File Using Mapped Access 

A major enhancement to the MPE/iX file system is mapped file access, a
method that allows you to access a file directly through memory load and
store instructions.  Mapped file access is available through two HPFOPEN
intrinsic optional parameters:

   *   Item #18 short-mapped option returns a 32-bit value of type
       address.

   *   Item #21 long-mapped option returns a 64-bit value of type
       address.

MPE/iX 5.0 Documentation