EverDrive Forum

General => FXPAK (SD2SNES) => Topic started by: pickleloaf on December 10, 2017, 06:37 PM

Title: background glitches on Donkey Kong Country
Post by: pickleloaf on December 10, 2017, 06:37 PM
From the very first stage, I have found that the backgrounds on some stages are entirely glitched. They still scroll as normal, but just appear as a mess of colored pixels.

Not every stage is like this. It is some jungle stages, seemingly every "cave" stage and every boss stage that would have the piles of bananas in the background. The game is completely playable otherwise.

I have seen a thread about glitches in this game:
https://krikzz.com/forum/index.php?topic=5669.0
but I'm not sure this is the same. It's only the backgrounds and only on certain stages.

I have tried multiple roms and multiple roms of Super Donkey Kong and all are the same. I have also not noticed anything like this on other games I have played.

I've also tried turning off hooks per this page:
https://sd2snes.de/blog/compatibility/in-game-hook-compatibility

I can't really tell if anything is happening when I press the button combinations, but it does not change the background issue.

I'm using a Super Famicom, and my SD2SNES firmware is up to date.

Anyone else seen this issue?
Thanks!

(https://i.imgur.com/Gwkzds5.jpg)
Title: Re: background glitches on Donkey Kong Country
Post by: pickleloaf on December 10, 2017, 06:46 PM
(https://i.imgur.com/twrB0jz.jpg)

(https://i.imgur.com/yx51ior.jpg)
Title: Re: background glitches on Donkey Kong Country
Post by: ozzy2k on December 10, 2017, 06:51 PM
Do you have the retail copy of the game?
Did you run the diagnostics firmware for SD2SNES to exclude the flashcard?
https://sd2snes.de/blog/cool-stuff/sd2snes-diagnostics (https://sd2snes.de/blog/cool-stuff/sd2snes-diagnostics)

Run the SNES burn-in test cartridge (Unknown) (Rev D) to exclude defective chips on your SNES.

Which chip revisions does your SNES have?
You can check this with Lion King in the Option Menu and the Barry Code.
Title: Re: background glitches on Donkey Kong Country
Post by: fille1976 on December 10, 2017, 08:14 PM
try without ingame buttons
Title: Re: background glitches on Donkey Kong Country
Post by: pickleloaf on December 10, 2017, 08:33 PM
i don't have a retail copy of the game to try

everything on the diag test seems to pass. i am attaching the text file from that.

the burn in test had something fail. i dont know what it means. is my SFC busted?

(https://i.imgur.com/HBBdT07.jpg)

lion king says
CPU: 2
PPU1: 1
PPU2: 3
Title: Re: background glitches on Donkey Kong Country
Post by: pickleloaf on December 10, 2017, 08:34 PM
try without ingame buttons

I think I turned that off, but I cant tell since nothing happens when I press L+R+Start+Y
Title: Re: background glitches on Donkey Kong Country
Post by: pickleloaf on December 10, 2017, 09:09 PM
took a video of the burn in test so i could catch a couple things that weren't staying on the screen before the screenshot above

i guess there's something wrong with my system, but i don't understand any of this stuff

 :(

(https://i.imgur.com/IZV6pl7.jpg)

(https://i.imgur.com/BrqMVmF.jpg)
Title: Re: background glitches on Donkey Kong Country
Post by: pickleloaf on December 10, 2017, 09:15 PM
checking out this page

http://www.projectvb.com/nss/logs.htm

looks like the high fail for me is VRAM, but it isn't displaying properly

DMA fail and VRAM high fail on that page seemed to be resolved by replacing CPU and/or PPU which is most definitely out of my knowledge and comfort level.

bleh
Title: Re: background glitches on Donkey Kong Country
Post by: Captain318 on December 10, 2017, 11:55 PM
Failing PPU's are getting pretty common on the Rev 1 SNES consoles. Ive personally had 3 cross my path in the last few years. This for some reason seams far less likely on the Rev 2 and up models ie the models w/o detachable sound cards
Title: Re: background glitches on Donkey Kong Country
Post by: pickleloaf on December 14, 2017, 03:38 AM
A couple of possiblymaybeprobablyyes dumb questions

- could this be caused by an improper power supply?

- can anyone tell by looking at this if there is a certain layer or type of graphic affected? The reason I ask that is that I’d like to test other games to look for similar anomalies. Are these things I could look for? I have not seen this i any other game I’ve played on this particular system
Title: Re: background glitches on Donkey Kong Country
Post by: pickleloaf on December 14, 2017, 03:38 AM
Also, given the results I have here, will this issue most likely worsen?
Title: Re: background glitches on Donkey Kong Country
Post by: ozzy2k on December 14, 2017, 01:41 PM
- could this be caused by an improper power supply?

It could be have you test another psu with the console?
Title: Re: background glitches on Donkey Kong Country
Post by: pickleloaf on December 14, 2017, 06:56 PM
I don’t, but I just ordered an extra official Genesis model 1 adapter on eBay - I’ve read those are ok?
Title: Re: background glitches on Donkey Kong Country
Post by: bakageta on December 15, 2017, 08:59 PM
The Genesis adapter is fine for a super famicom, but I really don't think this is a power issue. It looks like a failing PPU, and that generally means just replacing the entire system. It's repairable, but only by cannibalizing another working system, and at that point you might as well just use the other system.
Title: Re: background glitches on Donkey Kong Country
Post by: pickleloaf on December 16, 2017, 12:10 AM
Cool thank you

Is there a way to spot a model online that may help to avoid this issue again?
Title: Re: background glitches on Donkey Kong Country
Post by: pickleloaf on December 16, 2017, 07:15 PM
Update for anyone keeping score:

A different power adapter (now using a model 1 genesis adapter) has not made a difference

Hopefully all my random posts here can help someone in the future
Title: Re: background glitches on Donkey Kong Country
Post by: bakageta on December 17, 2017, 11:06 PM
Is there a way to spot a model online that may help to avoid this issue again?

So, looking back at your pic and this page with repair logs (http://projectvb.com/nss/logs.htm), it definitely looks like a PPU failure. Anyway...

The super famicom jr has a completely different PPU, it's quite a bit newer, has a slightly sharper picture, and it's very visually distinct... They're also more expensive, behave slightly different in a few games, they don't output RGB or S-video (?) without modding, and personally I'm not a huge fan of the design. If you want the classic style console, you're going to need to go off of serial number. Generally speaking, the newer the better. Mine is OLD and starts with S108, and there's a 1CHIP-01 at S249 and a couple of 1CHIP-02's around S251 on ebay. If you're after a US system, UN3 is a good starting point. UN31+ have a decent chance of being a 1CHIP system.

There's a good writeup on assemblergames (https://assemblergames.com/threads/best-snes-revision.38581/) that details the differences between the various revisions. I'm not as much of a stickler for absolute perfect picture quality as some are, my old SFC looks just fine to me but I've got no interest in RGB and a PVM, so... If it doesn't matter much to you, I'd grab the cheapest SFC you can find in the S20+ serial range. Otherwise, grab a Jr or an ~S249+ system.

This one (https://www.ebay.com/itm/Nintendo-Super-Famicom-Console-SNES-Japan-Import-79/182892563209) is ugly as dirt, but cheap enough if you don't mind waiting for shipping from Japan. A bit newer (https://www.ebay.com/itm/Super-Famicom-Console-Console-JP-GAME/401460930607), much prettier, and has a couple controllers as bonus. Here's a 1CHIP-01 (https://www.ebay.com/itm/USED-Super-Famicom-System-CONSOLE-ONLY-SNS-CPU-1CHIP-01-Japanese-version/162792017905), pretty big price jump because the seller ID'd it as 1CHIP, but I can't be bothered to check EVERY serial on eBay. Finally, the Jr (https://www.ebay.com/itm/Super-Famicom-Jr-Junior-Mini-Console-Nintendo-SFC-SNES-Japan-Import-US-Seller-B/152717472413), this time shipped from the US. Hopefully that helps.
Title: Re: background glitches on Donkey Kong Country
Post by: pickleloaf on December 18, 2017, 01:47 AM
Amazing
Thanks