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Thread: Secrets of the Sega Mega CD

  1. #61
    djvectorman/#1sunsfan Road Rasher Vector's Avatar
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    Quote Originally Posted by zyrobs View Post
    You can change (some of) the palettes out during the horizontal blanking interval, ie. when a scanline has finished and the CRT beam is retracing to start drawing the next line. Toy Story does that in the cutscenes, to use unique colour sets for two different images. But the Sonic games would be a better example with their underwater effect.
    Ah very cool, however I heard there is another new glitch found which renders all 4096 colors in a still picture mode. Any truth to that?

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    Raging in the Streets Sik's Avatar
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    No :​P

    There's the idea of streaming to the background color using DMA across the whole screen (but that gives you 512 colors). Pixels are doubled… aside from a few columns, where they're even wider. Also the image in question ends up being larger than RAM, and unless you slap extra hardware on the cartridge you're stuck with streaming it from ROM, and also CPU is completely halted while the image is displayed, which limits its usefulness (Sega CD has it easier due to its separate CPU and loads more of RAM that it can swap between both sides quickly, but the inconsistent pixel size remains a problem).

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    djvectorman/#1sunsfan Road Rasher Vector's Avatar
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    Seems we are both right as this guy who did incredible tricks with genesis and saturn games explains at 2:13 of https://youtu.be/o8qgArSqMsc "If we could have gotten hold of better digital images or quality in the 90s, we could display 4096 colors images using this trick". Great content on this channel however I cant verify it more than claims but you both know your stuff.
    Last edited by Vector; Yesterday at 07:02 AM.

  4. #64
    16-bits is all he needs Master of Shinobi matteus's Avatar
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    Quote Originally Posted by Vector View Post
    Seems we are both right this guy who did incredible tricks with genesis games 256 520 and 4096 colors can be shown (now) at 2:15 https://youtu.be/o8qgArSqMsc
    Great content on this channel however I cant verify it more than claims but you both know your stuff
    I actually cover 256 colours in part 1. To my knowledge no one's tried it for FMV. Guessing it would look pretty ugly.


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    djvectorman/#1sunsfan Road Rasher Vector's Avatar
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    Quote Originally Posted by matteus View Post
    I actually cover 256 colours in part 1. To my knowledge no one's tried it for FMV. Guessing it would look pretty ugly.
    Maybe I heard wrong, but didn't that programmer say all 4096 colors @ 2:13 of that video? https://youtu.be/o8qgArSqMsc "If we could have gotten hold of better digital images or quality in the 90s, we could display 4096 colors images using this trick".?

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    16-bits is all he needs Master of Shinobi matteus's Avatar
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    Yeah he's does mention the 4096 trick. My understanding was this could only be used for still images unless used in conjunction with the cd but I've never seen anyone go beyond the 256 in animation. It's not an area I specialise in unfortunately Sik might know more.


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    The MD can't physically display that many colours, what the guy talks about is simulating extra colours via clever dithering.

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    16-bits is all he needs Master of Shinobi matteus's Avatar
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    Quote Originally Posted by zyrobs View Post
    The MD can't physically display that many colours, what the guy talks about is simulating extra colours via clever dithering.
    Seems a 60hz only thing too!


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    16-bits is all he needs Master of Shinobi matteus's Avatar
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    So in other words it's a 256 limit unless static


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    djvectorman/#1sunsfan Road Rasher Vector's Avatar
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    Quote Originally Posted by matteus View Post
    Yeah he's does mention the 4096 trick. My understanding was this could only be used for still images unless used in conjunction with the cd but I've never seen anyone go beyond the 256 in animation. It's not an area I specialise in unfortunately Sik might know more.
    Ok thank you. If MD couldn't do the 4096 color trick even in a static/still/pic, then he should have never said it in video imo. However if it is possible just with a picture glitch, that is awesome. As you can see some people claim yes some say no. Thank you for answering my questions though btw. I subbed to your channel it is awesome. One day I hope to understand the Cinepak bgvanburr specs and boot file in created iso so I could watch MoS on my KegaCD like I did with Game Sack episode.

    Quote Originally Posted by matteus View Post
    So in other words it's a 256 limit unless static
    256 colors on moving art is great man for a 64 color limited on screen "limit" imo. I mean this episode you made here was great, I'd even take that quality and color count even though it seems it was on MD and not CD. https://www.youtube.com/watch?v=7jHNu3eZvQQ&t

    "Sega Mega Drive/Technical specifications - Sega Retro
    https://segaretro.org/Sega_Mega_Driv...specifications
    64 9‑bit words (72 bytes) of internal CRAM (Color RAM) — used to store the color palette. 64 colors .... Static bitmap images: Up to 4096 colors (12-bit). Colors ..."
    Last edited by Vector; Yesterday at 10:15 AM.

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