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  Description:
 
     The routine starts at the left-hand end of source and target and
     EQUIVALENCEs the bits together, storing the result in target. The
     truth table for this is:
 
                source target result
                   0     0      1
                   0     1      0
                   1     0      0
                   1     1      1
 
     See also: ◄Introduction to logic routines►
 
  Parameters on Entry:
 
     source                  One of the data items to EQUIVALENCE.
 
     target                  The other data item to EQUIVALENCE.
 
     length                  The number of bytes of source and target
                             to EQUIVALENCE. Positions in target beyond
                             this length are unchanged.
 
  Parameters on Exit:
 
     target                  The result.
                                    -♦-