As google tells us: A wafer sorter is an automated system designed to handle, sort, align, identify, and transfer wafers between cassettes or process tools. It ensures that wafers are correctly oriented, placed in the right sequence, and mapped accurately for downstream processes.
A wafer sorter is one of several systems that make up a semiconductor wafer production line.
The CSMT-2 is an older model and the control software is OS/2 based. I don't know exactly how many are still in production use, but they are definitely still in use on some production lines.