I know scart was very popular over in Europe and the UK back in the day but what about Japan with there jpn 21 pin rgb. Hell I have never scene a jpn crt tv with a rgb port on it,tried to look on the net but to no avail. Is it because once something new comes out in japan then the old is just forgotten about.
From what I understand, some TVs had it, but it wasn't very common. I guess it's similar to how S-video was in the US. It existed for a while, but most people weren't even aware of it.
How much of European devices that accepted SCART were truly RGB? I believe they simply used SCART for composite and S-Video.
It was uncommon for me to find a CRT in the UK that didn't support RGB, I have came across some units although they were usually old and missing a remote. Any reasonable unit from the early 90s and onwards should have RGB support, it was a lot more common to find units that lacked 60hz support, if anything that's what I'd be worried about.
How about a Japanese set with four different RGB sockets? Kind of nonsense that helped kill its adoption in the US. http://homepage1.nifty.com/y-osumi/parts/pc-tv453n/
Sony had their own typical format for RGB just to screw everyone over like they do with all of their equipment however some TVs from the likes of Hitachi, Panasonic, JVC, Toshiba and Sharp did have 21 pin RGB connectors but these were Japanese standard. They look the same as the Euro type but they are wired up differently. They were not common though Only Europe, most notability the UK that really took RGB on as a true format. As mentioned above, any TV from the 90's onward would have had true RGB on it but maybe only 50htz compatible.