As this project uses internal clock I have merged both SELECT inputs from Megadrive cotrollers in a single line at pin PB7 OSC-OUT and left pint PB6 OSC-IN open just in case something go wrong with the fuses configuration and the AVR would expect to operate from external crystal.

A track was added to pin 7 which ends in a large track. Over the latter another track on the TSTOP layer as added so the solder mask will not be poured over it