      arithmetic data being processed and data whose order is to be reversed.</td>
  </tr>
  <tr valign="top"> 
    <td><strong>Status Flags<br>
      Status Register </strong></td>
    <td>The status Register contains status flags that indicate the outcome of 
      the previous calculation. The flags are Sign, Zero and Overflow. See SR.</td>
  </tr>
  <tr valign="top"> 
    <td><strong>Stepper motor </strong></td>
    <td>A special motor that rotates in small controlled angular movements. It 
 