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Thread: Lighttech A2000 Scan Doubler

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    bluethunder's Avatar
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    Default Lighttech A2000 Scan Doubler

    Hi Everyone.

    Few months ago, I found this project:
    https://www.lighttech-hg.de/index.ph...00-scandoubler

    A low cost video scan doubler for my A2000. I had some boards made, bought some parts, and assembled it over the last few weeks.

    This weekend, after fighting with my Xilinx cable, and the 14.7 version of ISE Webpack in a VM, I got the .jed file into the CLPD.

    I get a flicker of a distorted workbench, then black, rinse repeat, on my LCD

    I think it may have been designed with a PAL amiga in mind, and mine is NTSC.

    I'm not sure where to even start troubleshooting.

    Has any one else built one of these?

    Joe

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    mariuszk844's Avatar
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    Yup, i've builded it. It is neither good or bad scandoubler, it just work. Can you post photos of jumpers? IIRC i've used two jumpers to pick correct sync frequency on it.
    Last edited by mariuszk844; 16th December 2019 at 12:35.

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    bluethunder's Avatar
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    Thumbs down

    Quote Originally Posted by mariuszk844 View Post
    Yup, i've builded it. It is neither good or bad scandoubler, it just work. Can you post photos of jumpers? IIRC i've used two jumpers to pick correct sync frequency on it.

    The lighttech website doesn't really cover what the jumper settings are.

    Right now, I had tried no jumper, jumper on the bottom, and jumper on the top.


    Jumper layout:
    . . .
    . . .

    . . .
    . X X

    . X X
    . . .

    Cheers, Joe
    Last edited by bluethunder; 18th December 2019 at 16:47.

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    mariuszk844's Avatar
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    Sorry for late response
    I have my jumpers (two) set-uped like below

    . X X
    . X X

  5. #5
    8 Bit Dreams DjCook's Avatar
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    As much i can see - it is 2-layer board, GND and power are pin to pin attached, this means it will catch up any interference.. Hopefully picture quality is ok...
    I can recommend Matzes Flicker Fixer:
    Click image for larger version. 

Name:	2020-01-16 13.39.15.jpg 
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    Here on picture is rev.2 next version has few new features added
    Have built at least five of them and im very pleased with the quality of the output
    Last edited by DjCook; 16th January 2020 at 13:47.
    8 Bit Dreams - computer & hardware repair in Germany

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    mariuszk844's Avatar
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    Yeah, its quite ok. Only firmware is a bit broken and dont scale picture to 800*600... Its like You paste amiga picture into 800*600 frame.... Bottom 1/3 of screen is black or have random color pixels...

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