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Forum 6502 Video Out
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  • composite
  • mos
  • 6502
  • video out
Related

6502 Video Out

nick123
nick123 over 9 years ago

Hello,

I've been working on a 6502 SBC recently, and I wanted it to output to a composite video signal. I looked around the internet and didn't find much of anything. Anyone know a way I can do this?

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  • bwelsby
    bwelsby over 9 years ago in reply to nick123 +5 suggested
    Some info of what used to be here https://en.m.wikipedia.org/wiki/Video_display_controller The video subsystems of these oldies used to make up the bulk of the electronics in those machines and the display…
  • DAB
    DAB over 9 years ago +4 suggested
    Hi Nick, As I recall, the Commodore PET that I have used a batch of memory to hold the video data. All you need is a couple of counter chips to run through the addresses of the RAM chips. You take the…
  • michaelkellett
    michaelkellett over 9 years ago +4 suggested
    If you want to remain "classic" you would need to use a video controller MC6845 or perhaps 6569: MOS 6569R3 C64 VIC-II PAL chip, Mutant Caterpillar Games Ltd Retro Store Google for the 6845 data sheet…
Parents
  • dougw
    0 dougw over 9 years ago

    I interfaced an MC6847 to a 6502 way back in the day. I think I still have the wire-wrapped display card I built for my AIM65.

    This was one of the simplest ways to implement a video display back then, probably still is.

    These chips are still available on the net.

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  • nick123
    0 nick123 over 9 years ago in reply to dougw

    I looked at the data sheet and saw a pin labeled 'Y' what does that mean?

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  • nick123
    0 nick123 over 9 years ago in reply to dougw

    I looked at the data sheet and saw a pin labeled 'Y' what does that mean?

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  • jc2048
    0 jc2048 over 9 years ago in reply to nick123

    It's the luminance output. Basically the black and white part of the output.

     

    https://en.wikipedia.org/wiki/YUV

     

    The colour difference signals are on pins 10 and 11.

     

    The outputs were intended to go to another chip that would generate NTSC or PAL coded video which could then go to a rf modulator to give an output for a television.

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