sp,4</B></pre>


<BR><FONT SIZE="+1"><A NAME="fisub"></A><B>FISUB</B></FONT> (Subtract an integer located in memory from ST(0))

<pre>Syntax:    <B>fisub <EM>Src</EM></B>

Exception flags: Stack Fault, Invalid operation, Denormalized value,
                 Overflow, Precision</pre>

This instruction performs a signed subtraction of the source (<EM>Src</EM>) integer value from the value of ST(0) and overwrites the content of ST(0) with the result. The source must be the memory address of a 16-bit WORD or a 