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<title>Z80 Directives - Using as</title>
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<link rel="up" href="Z80_002dDependent.html#Z80_002dDependent" title="Z80-Dependent">
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<link rel="prev" href="Z80-Floating-Point.html#Z80-Floating-Point" title="Z80 Floating Point">
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 Free Software Foundation, Inc.
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<p>
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<a name="Z80-Directives"></a>Next: <a rel="next" accesskey="n" href="Z80-Opcodes.html#Z80-Opcodes">Z80 Opcodes</a>,
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Previous: <a rel="previous" accesskey="p" href="Z80-Floating-Point.html#Z80-Floating-Point">Z80 Floating Point</a>,
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Up: <a rel="up" accesskey="u" href="Z80_002dDependent.html#Z80_002dDependent">Z80-Dependent</a>
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<h4 class="subsection">9.32.4 Z80 Assembler Directives</h4>
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<p><span class="command">as</span> for the Z80 supports some additional directives for
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compatibility with other assemblers.
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<p><a name="index-Z80_002donly-directives-1700"></a>These are the additional directives in <code>as</code> for the Z80:
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<dl>
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<dt><code>db </code><var>expression</var><code>|</code><var>string</var><code>[,</code><var>expression</var><code>|</code><var>string</var><code>...]</code><dt><code>defb </code><var>expression</var><code>|</code><var>string</var><code>[,</code><var>expression</var><code>|</code><var>string</var><code>...]</code><dd>For each <var>string</var> the characters are copied to the object file, for
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each other <var>expression</var> the value is stored in one byte.
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A warning is issued in case of an overflow.
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<br><dt><code>dw </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dt><code>defw </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dd>For each <var>expression</var> the value is stored in two bytes, ignoring
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overflow.
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<br><dt><code>d24 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dt><code>def24 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dd>For each <var>expression</var> the value is stored in three bytes, ignoring
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overflow.
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<br><dt><code>d32 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dt><code>def32 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dd>For each <var>expression</var> the value is stored in four bytes, ignoring
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overflow.
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<br><dt><code>ds </code><var>count</var><code>[, </code><var>value</var><code>]</code><dt><code>defs </code><var>count</var><code>[, </code><var>value</var><code>]</code><dd><!-- Synonyms for @code{ds.b}, -->
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<!-- which should have been described elsewhere -->
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Fill <var>count</var> bytes in the object file with <var>value</var>, if
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<var>value</var> is omitted it defaults to zero.
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<br><dt><var>symbol</var><code> equ </code><var>expression</var><dt><var>symbol</var><code> defl </code><var>expression</var><dd>These directives set the value of <var>symbol</var> to <var>expression</var>. If
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<code>equ</code> is used, it is an error if <var>symbol</var> is already defined.
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Symbols defined with <code>equ</code> are not protected from redefinition.
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<br><dt><code>set</code><dd>This is a normal instruction on Z80, and not an assembler directive.
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<br><dt><code>psect </code><var>name</var><dd>A synonym for See <a href="Section.html#Section">Section</a>, no second argument should be given.
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</dl>
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