My Master System 2, will run off my Mega Drive 1 power supply quite happily.
I've no idea how similar the MS1 and MS2 power supplies are though, so that may be useless information for you.![]()
It would probably have been fine really but given the age I checked the bottom of the console.
9v 850mA for the Maaster Sytem
10v 1.2A for the Megadrive
I cooked my Disk Doctor drive a few years back overvolting the shoddy regulators they used
