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DATA TYPES CONVERSION Programmer's Guide: HP 3000 MPE/iX Computer Systems > Chapter 1 Introduction
Formatting Data Types |
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The designers of the computer specify specific formats for each data type so the computer can access or output a sequence of bits in a predictable way. The format specifies alignment and size. The alignment predicts the (starting) boundary; it tells where a meaningful unit of information begins. The size tells the length of the unit of information; it predicts the end. The proper format for a data type depends on two factors:
MPE XL supports two programming environments: Native Mode (NM) and Compatibilty Mode (CM). A program can be designed to run in NM or in CM, or to switch back and forth between subroutines in each of them. NM takes full advantage of Hewlett-Packard Precision Architecture (HP-PA), which is based on a 32-bit word. CM emulates the MPE V/E operating system, which is based on a 16-bit word.
Each environment supports its own high-level languages and compilers. Most are shown in Table 1-1 “Languages Supported on MPE XL”. Table 1-1 Languages Supported on MPE XL
For language-specific data types and formatting conventions, consult the appropriate language manual.
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