Quote Originally Posted by GamerAse View Post
I have had problems where not enough voltage would cause a console to freeze or shut down, but I am not familiar with the problems caused by not enough amperage. I'm currently trying to get an official Sega Genesis I adapter or similar so I can verify that it is indeed the adapter's fault. Would 1A be enough? I've seen posts that claim that the Sega Master System needs anywhere from 850 to 1200mA.
You just mentioned how you needed to set it at 12V because it wasn't working with 9V, though the system is meant to use 9V. That's because there isn't enough amperage. I had the same problem with a Model 1 Genesis, I bought a bundle locally and it just came with a universal adapter rated 300mA. It had similar problems that you're describing and needed to be set at 12V to work, and I noticed the adapter got super hot during use. I bought a proper Sega adapter and the system worked fine without any more video or sound problems. The systems are rated at 850mA but the proper adapters are usually capable of 1.2A, I guess they wanted to be sure that there wouldn't be any problems in case the system needed more power for some reason.