BUY 129B https://www.utsource.net/itm/p/12380266.html

The 129B is an integrated circuit (IC) from AT&T. It is a dual 4-bit static shift register with parallel load capability. It is packaged in a 24-pin dual in-line package (DIP). The 129B is a static shift register that can be used to store and shift digital data. It has two 4-bit registers, each with parallel load capability. The register can be shifted either left or right, and the data can be loaded in parallel. The 129B can be used in a variety of applications, such as data storage, data transfer, and data manipulation. It can be used in digital logic circuits, such as counters, decoders, and multiplexers. It can also be used in computer systems, such as memory and input/output (I/O) interfaces. (For reference only)