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The s390 version of as supports two architectures modes
and seven chip levels. The architecture modes are the Enterprise System
Architecture (ESA) and the newer z/Architecture mode. The chip levels
are g5, g6, z900, z990, z9-109, z9-ec, z10, z196, and zEC12.
| • s390 Options: | Command-line Options. | |
| • s390 Characters: | Special Characters. | |
| • s390 Syntax: | Assembler Instruction syntax. | |
| • s390 Directives: | Assembler Directives. | |
| • s390 Floating Point: | Floating Point. |