> there are also cheap active adapters utilising the CEC CSC0101A

"The CEC CSC0101A is an integral micro-controller for converting PS/2 interface signal to USB applications"

That's the other way around, for which adapters have been widely available since the dawn of USB.

Adapters like the subject of this thread allowing modern USB HIDs to be connected to older computers are much harder to find. I remember at one point seeing one advertised in a CDW catalog, but just that statement alone should date it.