> Playing video is very expensive task. Just updating 4K screen at 60 frames per second requires transferring of 3840×2160×60 ~ 497 million pixels or 1,49 Gbytes per second
Or an analog signal and you do it the way TVs used to do. There were analog HDTV standards before we all moved to digital.
Modern digital transfer protocols are generally 10x the pixel clock in analog terms. For a given clock speed, analog video can be several multiples of effective resolution delivered on time.
Analog standards seem to have stopped at 1080p. Nothing prevents signalling faster, but there are no capable displays to read it. I suppose that might be a neat FPGA project. Take 4K analog signals and stream them to a digital display. Really would only need a scanline or two of buffer for the simpler "just push all the pixels" use case. Frame buffer.
Not the original 6510, but there are some very fast 8-bit processors out there. If you compress the color space, they may be able to flip every pixel 30 times per second.
Also, nothing stops you from implementing an 8-bit CPU with a modern process and push it into the multi gigahertz range except perhaps the fact it’ll be too small for current machinery to manipulate.
Or an analog signal and you do it the way TVs used to do. There were analog HDTV standards before we all moved to digital.