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Thread: New board: The VIC-IIČ - PAL/NTSC switch board for Commodore 64

  1. #101
    Whydoisay's Avatar
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    I would like to get one of these when they are available. Please put me on the list! Thank you.

  2. #102
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    **** Live update - Current interest: 70 units ****
    I'll pick one up when they're ready This is a great project! Thanks for the support!

  3. #103
    Fight against racism Amibayer! Akira's Avatar
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    Quote Originally Posted by 1stage View Post
    Quick update:
    - We're testing the final candidate boards. They work but we need to make sure our installation instructions are clear, correct, and concise.
    - It is a single-board solution (not two as previously mentioned), but there will be both a 250407 and a 250425/250466 version of the board. This accommodates the different location of the jumpers, crystals, and VIC-II sockets between the two motherboards.
    - Doesn't fit in a 64c-style case at this time. Sorry. Not a lot of head room, so breadbin cases only for now.
    - Doesn't require a case mod. The switch can be trailed out the RF channel switch hole without interrupting it's function.
    - Only switches modes AFTER power is turned off, and you can keep it in whichever "default" mode you want. BUT, you must power off. A soft reset won't do it (latching relays).
    Well I am curious about how you made this happen, as I have tried this in the past and gave up because I couldn't get stable signals, especially on a breadboard setup. The image would be fekking unstable. I have a C64 half unbuilt with the breadboard setup for this that's been collecting dust for years. I think we ran into basically teh same issues, wires just don't work, but what is that pic on page 1 with a VIC running on a breadboard? I couldn't get such a stable pic at that point because of all the cable nonsense (interference all around)

    Weird about not fitting a C64C though, that leaves my interest out of the equation. I was working on fitting it in mine.
    Good job on making this to completion unlike me.
    [edit] oh I just read it now fits a C64C case. Nice one. Still want to see the instructions and why you are desoldering so much stuff on the board. Did you mess with the clock? I didn't seem to think you need to desolder anything but the crystal.
    Last edited by Akira; 7th June 2019 at 15:47.


  4. #104
    DonChaos's Avatar
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    I am interested in 1 assembled boardwhen they are available. Please put me on the list!

  5. #105
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    Quote Originally Posted by Akira View Post
    Still want to see the instructions and why you are desoldering so much stuff on the board. Did you mess with the clock? I didn't seem to think you need to desolder anything but the crystal.
    When I tried converting my NTSC 250407 board to PAL by simply replacing the crystal (and setting the appropriate jumper) I got a stable picture, but no color. Maybe it has to do with that? I know others have had similar issues with the same board...
    Last edited by adimifus; 12th June 2019 at 18:59.

  6. #106
    Retro YouTuber Starglider's Avatar
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    Quote Originally Posted by Akira View Post
    Still want to see the instructions and why you are desoldering so much stuff on the board. Did you mess with the clock? I didn't seem to think you need to desolder anything but the crystal.
    Yup, detailed instructions will be provided. If you refer to the video linked in the first post, it shows all the things you have to do to convert NTSC<>PAL. What we are doing is making that conversion switchable, though it's easier said than done.
    Starglider aka Perifractic

    "Recordar es vivir" | Remembering is living

  7. #107
    rmzalbar's Avatar
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    I'd like to be added to the list!
    1 for the 250407
    Thank you for your sacrifice. I know how much work these things tend to become.
    Last edited by rmzalbar; 24th June 2019 at 08:09.

  8. #108
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    I would be interested in one kit once they become available!

  9. #109
    Retro YouTuber Starglider's Avatar
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    Default Update: Beta announcement! 🎉

    We have just launched a public beta! See original post to apply.
    Last edited by Starglider; 21st July 2019 at 19:43.
    Starglider aka Perifractic

    "Recordar es vivir" | Remembering is living

  10. #110
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    Default Why 64c-style cases didn't work for this...

    By the way, below is a picture of the versions we tested for use on 250407 and 250425/250466 motherboards in the 64c-style cases. Space-wise, they fit GREAT, even with heat sinks!

    BUT

    The main problem (as Akira and others mentioned) was that the analog signal paths from the VIC-II socket headers to the two VIC-II chips was too long... I couldn't get color signal to work at that length. So we went back to our basic rectangular layout, which had the shortest possible signal paths between the headers and the chips (through the relays).

    Click image for larger version. 

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    - - - Updated - - -

    Final versions will look about like this...

    Click image for larger version. 

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    Last edited by 1stage; 22nd July 2019 at 23:42. Reason: minor text tweaks

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