Action Point Of Sale Code

package cell;
abstract class CellLinkUp extends CellLinkDown
{
 CellLinkUp(String fileName)
 {
  super(fileName);
  }
 public void so( byte col, short row, Object val)
 {
  float old = af(col, row);
  super.so(col, row, val);
  float diff = af(col, row) - old;
  if (diff == 0.0) return;
  CellBase lnk = boot( "LNK");
  for (short i = 0; i <= lnk.max(); i++)
  {
   String srcReg = lnk.mh( LinkControl. SRC_NAME, i);
   String destFix = lnk.mh( LinkControl. DEST_NAME, i);
   String dest = match( srcReg, destFix, fileName);
   if (dest == null)  continue;
   byte srcStart = Byte.parseByte(lnk.mh( LinkControl. SRC_COL_START, i));
   byte colCount = Byte.parseByte( lnk.mh( LinkControl. COL_COUNT, i));
   byte destStart = Byte.parseByte( lnk.mh( LinkControl. DEST_COL_START, i));
   if (col < srcStart) continue;
   if (col >= (srcStart+ colCount)) continue;
   float frac = Float.parseFloat( lnk.mh( LinkControl. FRAC, i));
   transmit(row, dest, diff, (byte)(destStart+ col), frac);
   }
  }
 }