




<div class="mySlides">
  <div class="text">
  <FONT color="red" size=+2><B>
  <SPAN style="BACKGROUND-COLOR: yellow">
  Computer  <FONT color="blue">instructions</FONT>
  </SPAN>
  </B></FONT>
  </div>

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  <TR> <TD>
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  <UL>
  <LI> <FONT color="red"><B>Computer</B></FONT>
    <FONT color="blue"><B>instruction</B></FONT> =
    the <FONT color="red"><B>unit</B></FONT> of
   <FONT color="blue"><B>execution</B></FONT>
   performed by a <FONT color="red"><B>computer</B></FONT>
 <P>
 <B>Samples</B> of
  <FONT color="red"><B>computer</B></FONT>
  <FONT color="blue"><B>instructions</B></FONT>:
<P>
<UL>
<TABLE bgcolor="lightyellow" BORDER="5">
<TR> <TD>
  <font size="+2">
 <UL>
 <LI> <FONT color="red"><B>Add</B></FONT> 
       two <FONT color="blue"><B>numbers</B></FONT>

 <LI> <FONT color="red"><B>Compare</B></FONT>
       two <FONT color="blue"><B>numbers</B></FONT>
 <LI> <FONT color="red"><B>Jump forward</B></FONT>
      1000 <FONT color="blue"><B>instructions</B></FONT> in the
      <FONT color="red"><B>program</B></FONT>
 <LI> etc., etc.
 </UL>

</TD> </TR>
</TABLE>
</UL>
<P>
<LI> <FONT color="red"><B>Computer</B></FONT>
   <FONT color="blue"><B>instructions</B></FONT> are
  <FONT color="red"><B>encoded (= represented)</B></FONT>
   by a <FONT color="blue"><B>numeric</B></FONT>
  <FONT color="red"><B>machine instruction</B></FONT>
  <FONT color="blue"><B>code</B></FONT>
<P>
<B>Example:</B>
<P>
<UL>
<TABLE bgcolor="lightyellow" BORDER="5">
<TR> <TD>
  <font size="+2">
<FONT color="blue">
<B>
<PRE>
  1 = "Add"    2 = "Subtract"   3 = "Compare"   4 = "Jump"       
</PRE>
</B>
</FONT>

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</UL>
<P>

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<div class="mySlides">
  <div class="text">
  <FONT color="red" size=+2><B>
  <SPAN style="BACKGROUND-COLOR: yellow">
  Computer <FONT color="blue">program</FONT>
  </SPAN>
  </B></FONT>
  </div>

  <p style="margin-left: 1.2in">
  <font size="+2">

  </font>
  </p>

  <center>
  <TABLE bgcolor="lightcyan" BORDER="5" width=850>
  <TR> <TD>
  <font size="+2">
  <UL>
  <LI> <FONT color="red"><B>Computer</B></FONT>
    <FONT color="blue"><B>program</B></FONT> =
   a <FONT color="red"><B>series</B></FONT> of
   <B>computer</B> <FONT color="blue"><B>instructions</B></FONT>
   that <FONT color="red"><B>collectively</B></FONT> performs
   a <FONT color="red"><B>useful</B></FONT>
   (and <B>complex</B>)
  <FONT color="blue"><B>computation</B></FONT>
 <P>
<B>Examples:</B>
<P>
<UL>
<TABLE bgcolor="lightyellow" BORDER="5">
<TR> <TD>
  <font size="+2">
 <UL>
 <LI> A <FONT color="red"><B>tax return</B></FONT>
   <FONT color="blue"><B>program</B></FONT> will
   use <FONT color="red"><B>tax computation</B></FONT>
  <FONT color="blue"><B>rules</B></FONT> to compute
  one <FONT color="red"><B>tax return</B></FONT>
 <P>
 <LI> A <FONT color="red"><B>sort</B></FONT>
   <FONT color="blue"><B>porgram</B></FONT> will
    <FONT color="red"><B>sort</B></FONT> the
   <FONT color="blue"><B>input data</B></FONT> presented to
   the <B>program</B>
 <P>
 <LI> And so on.
 </UL>

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