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There are several types of shift registers:
PISO: parallel-in serial-out shift registers such as the
7495(?), 74HC165, 74HC166 serial parallel counter load a one and shift it out serially bingo sequential pulses
SIPO: serial-in parallel-out shift registers such as the 74HC595, 74HC4094, TPIC6595, TLC5925. Typically data is shifted into the register one bit at a time through "the" input pin. Most "POV clocks" and "POV displays" use such chips to drive the spinning LEDs.
Most such chips can be wired up to "shift left", or they can be wired up to "shift right", but once wired up can only do one or the other.
bidirectional SIPO: bidirectional serial-in parallel-out shift registers.
Once wired up, an external control line can dynamically switch it from "shift left" -- feeding in a new bit on the "least significant bit input pin" -- and at some other time it can "shift right" -- feeding in a new bit on the "most significant bit input pin".
"universal" shift registers, such as the 74AC299, can do any of the above (at different times): output the current state of the register in parallel, shift left, shift right, and load the new state of the register in parallel.
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