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- <a name="Z80-Opcodes"></a>
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- <p>
- Previous: <a href="Z80-Directives.html#Z80-Directives" accesskey="p" rel="prev">Z80 Directives</a>, Up: <a href="Z80_002dDependent.html#Z80_002dDependent" accesskey="u" rel="up">Z80-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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- <hr>
- <a name="Opcodes-22"></a>
- <h4 class="subsection">9.56.5 Opcodes</h4>
- <p>In line with common practice, Z80 mnemonics are used for the Z80,
- Z80N, Z180, eZ80, Ascii R800 and the GameBoy Z80.
- </p>
- <p>In many instructions it is possible to use one of the half index
- registers (‘<samp>ixl</samp>’,‘<samp>ixh</samp>’,‘<samp>iyl</samp>’,‘<samp>iyh</samp>’) in stead of an
- 8-bit general purpose register. This yields instructions that are
- documented on the eZ80 and the R800, undocumented on the Z80 and
- unsupported on the Z180.
- Similarly <code>in f,(c)</code> is documented on the R800, undocumented on
- the Z80 and unsupported on the Z180 and the eZ80.
- </p>
- <p>The assembler also supports the following undocumented Z80-instructions,
- that have not been adopted in any other instruction set:
- </p><dl compact="compact">
- <dt><code>out (c),0</code></dt>
- <dd><p>Sends zero to the port pointed to by register <code>C</code>.
- </p>
- </dd>
- <dt><code>sli <var>m</var></code></dt>
- <dd><p>Equivalent to <code><var>m</var> = (<var>m</var><<1)+1</code>, the operand <var>m</var> can
- be any operand that is valid for ‘<samp>sla</samp>’. One can use ‘<samp>sll</samp>’ as a
- synonym for ‘<samp>sli</samp>’.
- </p>
- </dd>
- <dt><code><var>op</var> (ix+<var>d</var>), <var>r</var></code></dt>
- <dd><p>This is equivalent to
- </p>
- <div class="example">
- <pre class="example">ld <var>r</var>, (ix+<var>d</var>)
- <var>op</var> <var>r</var>
- ld (ix+<var>d</var>), <var>r</var>
- </pre></div>
-
- <p>The operation ‘<samp><var>op</var></samp>’ may be any of ‘<samp>res <var>b</var>,</samp>’,
- ‘<samp>set <var>b</var>,</samp>’, ‘<samp>rl</samp>’, ‘<samp>rlc</samp>’, ‘<samp>rr</samp>’, ‘<samp>rrc</samp>’,
- ‘<samp>sla</samp>’, ‘<samp>sli</samp>’, ‘<samp>sra</samp>’ and ‘<samp>srl</samp>’, and the register
- ‘<samp><var>r</var></samp>’ may be any of ‘<samp>a</samp>’, ‘<samp>b</samp>’, ‘<samp>c</samp>’, ‘<samp>d</samp>’,
- ‘<samp>e</samp>’, ‘<samp>h</samp>’ and ‘<samp>l</samp>’.
- </p>
- </dd>
- <dt><code><var>op</var> (iy+<var>d</var>), <var>r</var></code></dt>
- <dd><p>As above, but with ‘<samp>iy</samp>’ instead of ‘<samp>ix</samp>’.
- </p></dd>
- </dl>
-
- <p>The web site at <a href="http://www.z80.info">http://www.z80.info</a> is a good starting place to
- find more information on programming the Z80.
- </p>
- <p>You may enable or disable any of these instructions for any target CPU
- even this instruction is not supported by any real CPU of this type.
- Useful for custom CPU cores.
- </p>
- <hr>
- <div class="header">
- <p>
- Previous: <a href="Z80-Directives.html#Z80-Directives" accesskey="p" rel="prev">Z80 Directives</a>, Up: <a href="Z80_002dDependent.html#Z80_002dDependent" accesskey="u" rel="up">Z80-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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