Simplest Shift Register using only OR Gates and UP DOWN Counter. Shifting procedure is going on by using the previous Load to the next counter.
Circuit Description:
5 input OR Gate with input 1 3 5 7 9 Keys. Output Pin 1 of first Up Down counter.
4 input OR Gate with input 2 3 6 7 keys. Output Pin 2 of first Up Down counter.
4 input OR Gate with input 4 5 6 7 Keys. Output Pin 4 of first Up Down counter.
2 input OR Gate with input 8 9 Keys. Output Pin 8 of first Up Down counter.
5 input OR Gate with input Pin 1 2 4 8 of first Up Down counter and 0 key. Output all Up Down counter Load point.
First Up Down counter A B C D to Second Up Down counter Pin 1 2 4 8
Second Up Down counter A B C D to Third Up Down counter Pin 1 2 4 8
Third Up Down counter A B C D to Fourth Up Down counter Pin 1 2 4 8
