9.53.1 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 instruction names
for the R800 processor, as far as they exist.