So I recently got two Mega Drives from a man with taste, and both are a bit of weird cases, and I would like to get some info on both I am hoping good old temp has people with the hardware and possible know how for these. First of all; the two models I got: MEGA DRIVE PAL-B(VE) MODEL 1601-07 and MEGA DRIVE MODEL HAA-2510 Respectively I understand these are an Asian PAL model, and Japanese model (or Japanese model sold in Asian markets) - Pictures: HAA-2510 1601-07 And before everything; Both models had their cartridge lock mechanisms removed. So questions: First of all, the weird part of the HAA-2510, Japanese model as I presume at least, was that it was seemingly modified to be a PAL system. I live in Finland and the consoles were probably imported long time ago, and to use the system they probably had someone modify it to work on PAL systems. I myself unmodified it by cutting abridge between JP3 and JP2 left side, here is graph what was done to it (and what I undid: All I want to know here is if I did something wrong making it into JP model like it is supposed to be, tell me. This bridges into my general question next... I'd like to do a on off on region mod to one of my mega drives in future, as instructed here: http://mdpal60.net/wiki/megadrive/regionmod/start The question is, How should I think this for the Asian Mega Drives. The guide was written with a PAL Mega Drive at hand and I am not even sure if this all is the same for the Asian ones I have. Specifically, How the diagram goes for these. If someone can make me one to clarify if there is difference with Asian ones, I am thankful. Also this goes into the next question, which unhelpfully is just: What the heck is this? This is soldered in my 1601-07, PAL one. I am fairly sure this is not an official part of the system, but I am also not sure what it is supposed to do. Best bet I can give is automatic region switcher or region regulator or - Well, I go back to what I said; I have no idea what this is. 307-007 gave no answers, and I have no large expertise other than basic parts and what they are supposed to do. All I know is that no matter what cartridge the mega drive works as a pal system - and I have both European and Japanese cartridges at my disposal. I am interested what it is but, in the end I might just use this mega drive with the wires it has for the switch mod. That just leaves me; how should switch modding Japanese/Asian Mega Drive go down Aside that, I am pretty happy obtaining both uncommon Asian and Japanese Mega Drive models. Currently only hardship is that I am pretty sure the JP jumpers are not the same in the Asia models, it feels like, and I need Anyway, thanks for reading and I would be happy if someone can answer how to properly switch mod Asian Mega Drive.