C:\Windows\System32\drivers\ftdibus.sys
In simple terms, ftdibus.sys allows Windows to communicate with FTDI chips over USB. When you plug in a device containing an FTDI chip, Windows loads this driver, which creates a virtual COM port (e.g., COM3 ). Your terminal software (PuTTY, Tera Term, etc.) then uses that COM port to send and receive serial data. ftdibus sys
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