http://www.allaboutcircuits.com/vol_4/chpt_12/3.html When I try and go to this link it comes up blank, but there is a typo. DIGI book chapter 12 Shift registers part 12.3 Parallel-in, serial-out shift register. Underneath the second graphic titled "Parallel-in/ serial-out shift register showing parallel load path" it says, "...passing data to the D inputs of type D flip flops Qa Qb Dc respectively.". It should say, " ...Qa Qb Qc respectively.". The same mistake is also made at the end of that paragraph.