I have to correct myself on this. My testing was incorrect before.   Connecting the 2600+ with a USB-C cable to your PC, putting the B-W / Color switch in the B-W position, pressing down game reset  while powering on will put the 2600+ into 'Stella Adapter mode'.   So you can use original controllers hooked to the 2600+ as a USB controller to play games with Stella on your PC (Joystick port 2 must be configured in Stella to work)          
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