I'm working on a megadrive handheld. And I normally use two adaptors(one for my megadrive and one for my screen). And I want to use one adaptor for both of them, but I dont know how to begin.
well, you can find the adaptor with the highest A/Ma rating (its on the brick) and then cut the wires off both, solder them to gether and put them on the adaptor/battery:
I think someone should ask: Do both run from the same voltage? If not, you'll need a voltage regulator on one of them (the one that takes the lower voltage).
IIRC, megadrive has a 7805 and those can run on the same voltage as a psone screen so they should both be able to be powered from the screen's power adapter (it supplies 1500ma, right?)
Assuming it's a Sony-branded PSone screen. Assume nothing with electronics
Besides, no one even mentioned PSone screen... I'd be wary to jump to such a conclusion.