Capture HD Card For Much Older Gaming Systems Suggestion

There is a capture HD card for current playable game systems; PS3, PS4, Xbox 360, Xbox One, Nintendo Wii, Nintendo Wii U, and Nintendo Switch. I was suggesting shouldn't there be a capture HD Card for some of our favorite classic game systems? For example, NES, SNES, N64, Nintendo Gamecube, Sega Genesis, Sega Saturn, Sega Dreamcast, PS1, PS2, Xbox, Game Boy, Game Boy Advance, Nintendo DS, and PSP.