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8.30.1 Options

The Zilog Z80 and Ascii R800 version of as have a few machine dependent options.

-z80
Produce code for the Z80 processor. There are additional options to request warnings and error messages for undocumented instructions.
-ignore-undocumented-instructions
-Wnud
Silently assemble undocumented Z80-instructions that have been adopted as documented R800-instructions.
-ignore-unportable-instructions
-Wnup
Silently assemble all undocumented Z80-instructions.
-warn-undocumented-instructions
-Wud
Issue warnings for undocumented Z80-instructions that work on R800, do not assemble other undocumented instructions without warning.
-warn-unportable-instructions
-Wup
Issue warnings for other undocumented Z80-instructions, do not treat any undocumented instructions as errors.
-forbid-undocumented-instructions
-Fud
Treat all undocumented z80-instructions as errors.
-forbid-unportable-instructions
-Fup
Treat undocumented z80-instructions that do not work on R800 as errors.


-r800
Produce code for the R800 processor. The assembler does not support undocumented instructions for the R800. In line with common practice, as uses Z80 instriction names for the R800 processor, as far as they exist.