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<a name="Z80-Options"></a>Next: <a rel="next" accesskey="n" href="Z80-Syntax.html#Z80-Syntax">Z80 Syntax</a>,
Up: <a rel="up" accesskey="u" href="Z80_002dDependent.html#Z80_002dDependent">Z80-Dependent</a>
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<h4 class="subsection">9.32.1 Options</h4>
<p><a name="index-Z80-options-1679"></a><a name="index-options-for-Z80-1680"></a>The Zilog Z80 and Ascii R800 version of <code>as</code> have a few machine
dependent options.
<a name="index-_0040code_007b_002dz80_007d-command-line-option_002c-Z80-1681"></a>
<dl><dt><span class="option">-z80</span><dd>Produce code for the Z80 processor. There are additional options to
request warnings and error messages for undocumented instructions.
<br><dt><span class="option">-ignore-undocumented-instructions</span><dt><span class="option">-Wnud</span><dd>Silently assemble undocumented Z80-instructions that have been adopted
as documented R800-instructions.
<br><dt><span class="option">-ignore-unportable-instructions</span><dt><span class="option">-Wnup</span><dd>Silently assemble all undocumented Z80-instructions.
<br><dt><span class="option">-warn-undocumented-instructions</span><dt><span class="option">-Wud</span><dd>Issue warnings for undocumented Z80-instructions that work on R800, do
not assemble other undocumented instructions without warning.
<br><dt><span class="option">-warn-unportable-instructions</span><dt><span class="option">-Wup</span><dd>Issue warnings for other undocumented Z80-instructions, do not treat any
undocumented instructions as errors.
<br><dt><span class="option">-forbid-undocumented-instructions</span><dt><span class="option">-Fud</span><dd>Treat all undocumented z80-instructions as errors.
<br><dt><span class="option">-forbid-unportable-instructions</span><dt><span class="option">-Fup</span><dd>Treat undocumented z80-instructions that do not work on R800 as errors.
<p><a name="index-_0040code_007b_002dr800_007d-command-line-option_002c-Z80-1682"></a><br><dt><span class="option">-r800</span><dd>Produce code for the R800 processor. The assembler does not support
undocumented instructions for the R800.
In line with common practice, <code>as</code> uses Z80 instruction names
for the R800 processor, as far as they exist.
</dl>
<p><a name="index-Z80-Syntax-1683"></a>
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