HP 3000 Manuals HP 3000 Manuals
Chapter 1 SPL Migration System Programming Language (SPL) is a language that was developed for the older HP 3000 computer systems, which currently run under the MPE V operating system. HP C/XL is the Hewlett-Packard implementation of the C programming language on the HP Precision Architecture 900 Series HP 3000 computer systems, which run under the MPE XL operating system. This guide will use the terms MPE V and MPE XL to refer to the two distinct architectures and operating environments. SPL was designed for systems programmers, in order to give them close control over the hardware stack, registers, and segmentation of the MPE V and earlier operating environments. Many SPL features are hardware-dependent--designed for specific machine instructions and registers. Most SPL special features are inappropriate for the MPE XL environment. Many of them are used chiefly to deal with the lack of space in the MPE V data area, a problem that largely disappears in the MPE XL environment. For a general discussion of MPE V to MPE XL migration issues, please read the Migration Process Guide and the Switch Programming User's Guide.