Author Topic: Mega EverDrive X3 Garbage pixels in some games  (Read 1026 times)

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Offline daneeall

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Mega EverDrive X3 Garbage pixels in some games
« on: December 15, 2020, 04:16 PM »
Tested on two NTSC USA TMSS Genesis 2 models VA1 with Samsung and Sony RGB encoders.
Cartridge: Mega EverDrive X3 OS 3.13
Garbage pixels present at the top of the options screen of Vectorman 2, at Comix Zone on the lower right corner of screen, at Tanglewood on the line of the water only when the fox is in the water.
Cart diagnosis shows no problems.
I believe that this isn't the console problem cuz it happens on two systems and looks exactly the same on both.
Here are some photos and videos of the problem:

https://youtu.be/DkLV4Cs2eZw
https://youtu.be/ZH5oZh6ZPgw
https://youtu.be/ilhTFJHdKS8
I wonder if it ever be fixed, or X3 is discontinued?
« Last Edit: December 15, 2020, 10:18 PM by daneeall »

Offline Assman

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Re: Mega EverDrive X3 Garbage pixels in some games
« Reply #1 on: December 17, 2020, 06:32 AM »
They're just CRAM dots. If I recall correctly, every time a new palette entry is swapped in, a dot (or multiple dots) will show up somewhere on the screen, so it's simply a matter of whether or not the developers have tried to move them to a less conspicuous portion of the screen. This will also happen with the original carts and has nothing to do with the Everdrive. The Sonic games are well-known for doing this when water is on the screen (they change palettes mid-screen to effectively double the number of colors that can appear at one time), leaving a waterline consisting of these garbage pixels.

The only way to get away from them is to play via emulation.

Offline daneeall

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Re: Mega EverDrive X3 Garbage pixels in some games
« Reply #2 on: December 17, 2020, 04:40 PM »
This will also happen with the original carts and has nothing to do with the Everdrive.
Can you check this on original cartriges? Actually I dont remember any glitches on Vectrorman 2 when I played it in 90x.
It would be very nice if someone could check these glithches on their everdrives (x3,x5,x7,pro).

Offline freaktmp

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Re: Mega EverDrive X3 Garbage pixels in some games
« Reply #3 on: December 17, 2020, 10:25 PM »
Capture of original hardware shows these dots:

https://youtu.be/hph24q7NA5A?t=11

Offline daneeall

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Re: Mega EverDrive X3 Garbage pixels in some games
« Reply #4 on: December 18, 2020, 07:59 AM »
Capture of original hardware shows these dots:

https://youtu.be/hph24q7NA5A?t=11
Is that your footage? At the video description, I don't see a word of what game cartridge is used there.

Offline freaktmp

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Re: Mega EverDrive X3 Garbage pixels in some games
« Reply #5 on: December 18, 2020, 11:55 AM »
It is not my video.

Offline Assman

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Re: Mega EverDrive X3 Garbage pixels in some games
« Reply #6 on: December 19, 2020, 09:44 AM »
It's not the Everdrive, it's a hardware bug. There's nothing to check and there's nothing to fix. Our memories are not reliable for details like these, especially when you're comparing a recent experience as an adult with upscaled RGB on a modern display to a 25-year-old experience as a kid with composite or RF on a CRT that likely cut off the affected portion of the image (as I mentioned, efforts were often made to hide the artifacts by taking advantage of the limitations of displays used at the time).

For reference, the Mega SG by Analogue has an option to turn CRAM dots on or off depending on the level of authenticity you want. That's about the closest thing you're going to get to a real Genesis without them.

Offline Marteicos

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Re: Mega EverDrive X3 Garbage pixels in some games
« Reply #7 on: December 19, 2020, 11:10 PM »
With old crts those dots appears on overscan area. So not remember them is expected.