PCB looks like the usual quality we've come to expect from Korea. But what were the 'rules' to sell your goods over there as a Japanese manufacturer? I see a lot of Korean parts on boards from that region like Goldstar, Hyundai and the usual wierd Eprom types (27C4086=27C010 etc.)
I know there was some beef between Japan and Korea back then, but games were made and sold nonetheless. Just curious to know the requirements back in the day