Why Windows cannot recognize my PS/2 mice or keyboard using PS/2 to USB adapter?

Q. Why Windows cannot recognize my PS/2 mice or keyboard using PS/2 to USB adapter?
A.
USB to PS/2 adapters are simple PASSIVE ADAPTERS that simply change the plug shape to match the outlet.
PS/2 to USB adapters are ACTIVE ADAPTERS that use an integrated circuit to translate the PS/2 mice or keyboard signal and convert it into a USB signal.
It means if PS/2 to USB adapter doesn't work with your old input devices, the chip inside adapter is broken.

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