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The s390 version of as supports two architectures modes
and eleven chip levels. The architecture modes are the Enterprise System
Architecture (ESA) and the newer z/Architecture mode. The chip levels
are g5 (or arch3), g6, z900 (or arch5), z990 (or arch6), z9-109, z9-ec
(or arch7), z10 (or arch8), z196 (or arch9), zEC12 (or arch10), z13
(or arch11), z14 (or arch12), and arch13.
| • s390 Options: | Command-line Options. | |
| • s390 Characters: | Special Characters. | |
| • s390 Syntax: | Assembler Instruction syntax. | |
| • s390 Directives: | Assembler Directives. | |
| • s390 Floating Point: | Floating Point. |