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  Description:
 
     The routine starts at the left-hand end of target and inverts
     bits. The truth table for this is:
 
                before   after
                  0       1
                  1       0
 
     See also ◄Introduction to logic routines►
 
  Parameters on Entry:
 
     target                  The data to operate on.
 
  Parameters on Exit:
 
     target                  The data with the bits inverted.
 
     length                  The number of bytes of target to change.
                             Positions beyond this are unchanged.
                                    -♦-