Be very very carefull with Sega PSU's.
They are tons of them and they are all different.
As i'm collecting consoles SEGA only and i have more than 55. I can assure that many times the psu's are different each other not only by their plug but also the wattage,load (amps) and their polarity
The most dangerous thing that people don't observe is the polarity.
Thus they use wrong polarity psu with result to damage the mainboard or some caps.
Universal PSU's are not recommended at least by me.
This is true and advisable, in particular using cheap products: when current is badly stabilized and very unclean, the internal regulator of a consolle like a Sega Genesis operate under stress conditions. Using a product of good quality which has the proper amperage will only be good.Universal PSU's are not recommended at least by me.