Short story long, most 80's and 90's era game consoles used off-the-shelf integrated circuits for video/picture processing, and most of those integrated circuits generated RGB as well as composite video. As a result, even when the console manufacturers didn't bother to connect the RGB lines, RGB could still be enabled by tapping the RGB lines from the IC directly and connecting an amplifier to drive them. The best example of this is the Turbo Duo/PC Engine Duo. When it comes to the NES/Famicom, things become a bit more interesting. Nintendo used a custom "PPU" chip to drive video, and as a result, RGB is not exposed, and can't simply be "tapped and amplified". Enter the NESRGB. Rather than trying to tap RGB from somewhere on the board, the NESRGB actually hijacks the entire PPU chip. You literally have to desolder the PPU from the board and place a device in between it and the system. I mean, look at this thing, it's crazy. NES RGB Mod - the...
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