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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…
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  • DAB
    0 DAB over 9 years ago

    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 digital output and run it into a transistor with a couple of capacitors and resisters to create the analog out, synchronize the Horizontal and vertical sync waveforms and you have video output.

     

    Back in the OLD days we used this approach for all types of microprocessors.

    Later, people came out with digital to video out chips.

     

    Plus you always have the option of hacking an old PC video card.  Most of them allowed you to load digital information into the onboard ram and the card took care of the sync.

     

    DAB

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

    This sounds interesting, do you have example schematics?

     

    Thanks

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

    This sounds interesting, do you have example schematics?

     

    Thanks

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

    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 resolutions were only something like 320x240 .

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

    Maybe.

     

    I will have a quick look in my basement to see if there are any schematics of this basic design.

     

    DAB

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