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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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Top Replies

  • 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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  • shabaz
    0 shabaz over 9 years ago

    Hi Nick,

     

    Generally the 6502 can't do that, it cannot generate a 6MHz signal on its own with the right timings and content (there may be some hacks I'm sure that might obtain a low-res image onto a display however, through clever coding in assembler etc). Usually the old home computers used separate ICs and sometimes custom logic for that, but of course they are not manufactured nowadays. You could look at old home computer schematics and hope to find the parts on e-bay. Or you could use slightly more modern parts to create a video encoder (Analog Devices has some parts) but you still need a way of getting data from memory to the encoder, and that entails using a CPLD or FPGA usually.

    Basically times have moved on, and if you just want to display very simple information to a screen then you might want to consider (say) LCD displays with in-built memory and a simplified interface. If you're trying to recreate a vintage computer then you may need to consider programmable logic.

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  • shabaz
    0 shabaz over 9 years ago

    Hi Nick,

     

    Generally the 6502 can't do that, it cannot generate a 6MHz signal on its own with the right timings and content (there may be some hacks I'm sure that might obtain a low-res image onto a display however, through clever coding in assembler etc). Usually the old home computers used separate ICs and sometimes custom logic for that, but of course they are not manufactured nowadays. You could look at old home computer schematics and hope to find the parts on e-bay. Or you could use slightly more modern parts to create a video encoder (Analog Devices has some parts) but you still need a way of getting data from memory to the encoder, and that entails using a CPLD or FPGA usually.

    Basically times have moved on, and if you just want to display very simple information to a screen then you might want to consider (say) LCD displays with in-built memory and a simplified interface. If you're trying to recreate a vintage computer then you may need to consider programmable logic.

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