It should work like the Gotek, 2 buttons to go up / down on the ISOs that are in the microSD.Depends on how you plan to use it. You can put a single iso file on sdcard/usb drive or multiples and control which image is selected from a pc or other usb host (ie; raspberry pi)In that scenario, I should only put one game on it, right? (Due to how the 256 works?)