 AL ← AL AND 0FH;
         FI;
FI;</pre>
<h2>Flags Affected</h2>
<p>The AF and CF flags are set to 1 if there is a decimal borrow; otherwise, they are cleared to 0. The OF, SF, ZF, and PF flags are undefined.</p>
<h2>Protected Mode Exceptions</h2>
<table class="exception-table">
<tr>
<td>#UD</td>
<td>If the LOCK prefix is used.</td></tr></table>
<h2>Real-Address Mode Exceptions</h2>
<p>Same exceptions as protected mode.</p>
<h2>Virtual-8086 Mode Exceptions</h2>
<p>Same exceptions as protected mode.</p>
<h