allows the register to be loaded in one step. That, of course, requires an input line for each flip flop, as well as a control line to indicate load. Sometimes the loading is done statically (74165), as demonstrated for a typical bit (q2) in Figure 8.6a. Sometimes it is done synchronously (74166), as shown in Figure 8.6b. Both of these are serial-out, that is, there is only one output connection, from the right flip flop. There is a serial input to the left bit for shift operations (going to the same place in the first flip flop logic that q1 goes to in the typical bit in Figure 8.6).