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Best Dreamcast VGA Cable for OSSC?

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This topic contains 2 replies, has 3 voices, and was last updated by  Teddy Rogers 2 weeks, 1 day ago.

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  • #16946

    slickrasta
    Participant

    Hey I just got my new OSSC 1.6 and will be picking up a Dreamcast soon to mod. What kind of VGA cable is best to use with OSSC 1.6? Is this one a good choice: https://www.amazon.ca/Dreamcast-Definition-Cable-Adapter-Tomee/product-reviews/B00HPU96FI/ref=dpx_acr_txt?showViewpoints=1

    #16953

    nmalinoski
    Participant

    To my knowledge, the best Dreamcast VGA adapters are those from BeharBros. Their most basic model, Kuro, has an HD15 connector for video, RCA for audio, and lets you switch between 15kHz RGB (for 480i) or 31kHz VGA (for DTV 480p) depending on what the game you’re playing supports. The Hanzo model has the Kuro’s features, plus a scanline generator; and the Toro model has the Hanzo’s features, plus SCART output. They also have a newer model, Akura, that digitizes the RGB and VGA signals and outputs them over HDMI. (Personally, I’d go for the Toro, but you should get whichever one best fits your needs.)

    As for Tomee, from what I’ve seen, you should steer clear; they don’t make quality cables.

    #16954

    Teddy Rogers
    Participant

    Yes, it should be fine. I’ve used that and similar cables purchased off eBay, custom and home made cables and there has been no difference in appearance – that I can tell. I think with the Tomee, the comments regarding poor image quality, is primarily due to the device they are connecting to is displaying the VESA 640×480 aspect ratio and not the correct 480p for the Dreamcast. VGA improves the definition and clarity of the image and because the Dreamcast uses a fixed dithering technique on its output this shows up more evidently. When viewing VGA in VESA the dithering can become distorted making the image appear to have vertical lines running through it.

    In your OSSC be sure to select 480p in sampler and have H.active set to 640. I also have H.backporch at 111 and V.backporch at 33 (you may need to use slightly different settings) to correctly center the image. To help get the perfect image I actually use GDMenu as the fixed dithering is more pronounced and visible, if it looks straight and an even pattern the image is exactly as it should be. Take a look at this screenshot…

    http://i67.tinypic.com/14kgr3o.jpgGDMenu

    Ted.

    • This reply was modified 2 weeks, 1 day ago by  Teddy Rogers.
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