I found an interesting page that shows you how to overclock a genesis. It's pretty neat that you can feed the cpu a different clock signal and make it go faster.
Megadrive Overclocking (http://www.epicgaming.uk.ro/md_oc/)
I'm going to try it when I find a used Genesis.
Contact me if you need any assistance. :)
-- Epicenter
Epic Gaming Admin
http://www.epicgaming.net (http://www.epicgaming.net)