HPlogo Accessing Files Programmer's Guide: HP 3000 MPE/iX Computer Systems

Chapter 11 Accessing a File Using Mapped Access

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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.

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