I picked up a Genesis Game Genie the other day and it got me thinking, people often make fun of the fact that the Genesis had a million add-ons, both official and unoffical. And gets looking pretty ridiculous with them all attached the same time.
But my question becomes, how many system add-ons and peripherals can you actually have attached to a Genesis at one given time, and still get a result? A 'result' being, when you power the system on a cartridge based game will actually play.
Unfortunately I don't have all possible peripherals to test myself. But my guess is Model 1 Sega CD > Model 1 Genesis > 32X Add-On > Game Genie > Sonic & Knuckles Game Cart > Sonic 2/3
I'm unsure if you can use the 3DX with the Power Base Converter installed, if you can. That's another layer.