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# Machine Dependent Features

The machine instruction sets are (almost by definition) different on each machine where `as` runs. Floating point representations vary as well, and `as` often supports a few additional directives or command-line options for compatibility with other assemblers on a particular platform. Finally, some versions of `as` support special pseudo-instructions for branch optimization.

This chapter discusses most of these differences, though it does not include details on any machine's instruction set. For details on that subject, see the hardware manufacturer's manual.

- AMD29K-Dependent: AMD 29K Dependent Features
- H8/300-Dependent: Hitachi H8/300 Dependent Features
- H8/500-Dependent: Hitachi H8/500 Dependent Features
- HPPA-Dependent: HPPA Dependent Features
- i386-Dependent: Intel 80386 Dependent Features
- i960-Dependent: Intel 80960 Dependent Features
- M68K-Dependent: M680x0 Dependent Features
- MIPS-Dependent: MIPS Dependent Features
- SH-Dependent: Hitachi SH Dependent Features
- Sparc-Dependent: SPARC Dependent Features
- Z8000-Dependent: Z8000 Dependent Features
- Vax-Dependent: VAX Dependent Features

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