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as: Z80 Options

 
 9.55.1 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.
* Info Catalog Up as: Z80-Dependent Next as: Z80 Syntax