Okay here is the thing. I have two kinds of Genesis and the JP one I have is occupying the big fat ( Older Keyboard looking ) Input. The western version of the MD also has this port?
?? So you should be able to use the big fat AV or the single tiny looking version ( which should be the Game Switch for the Atari ).
Again I am not too sure. I know that when things got switched the US the ( NES and SNES ) were not backwards compadible with Atari Game Switches.
Please somebody confirm this.
Your looking for an RF that is an tiny single input to the system or maybe the big fat one that looks like it belongs to a keyboard from 1991?
I don't know as I have to disconnect everything before powering up both Genesis models.
It is just so many combinations/ Especially with the PCE which has a second model that also takes the fatty RF and the fatty AV out???
My best bet is trying the game switch from the Atari as SEGA uses it's technology.