Fried MVS carts can i recover?

Some time ago this happened to me and with that session i fried a kof2002 cart..

are there some methods to know what is burned inside?i opened the cart and it seems all ok..

Yeah you probably wouldn't see any physical damage unless you ran some obserdly high voltage through there.

I don't know much about the Neo Geo's hardware, but if the 12V you connected runs through that game as well, you can probably kiss those EPROMS goodbye.

Put a UniBIOS in the system and run a CRC check on the EPROMs... compare them to the MAME dumps and replace any that don't match.

RJ

channelmaniac said:

Put a UniBIOS in the system and run a CRC check on the EPROMs... compare them to the MAME dumps and replace any that don't match.

RJ

Click to expand...

please go in depth with this..i hope to get the cart working again..

Rengoku said:

please go in depth with this..i hope to get the cart working again..

Click to expand...

up

the unibios has feature to check the roms on the cart.

after you find out which proms then you have to get access to a eeprom flasher and the roms from mame.

solder them in the right places

You'll need to buy new EPROMs to replace the ROMs that are fried.

First ou check the CRC checksum values that UniBIOS gives you with the CRC values that you get from the various MAME websites. Any that don't match need to be replaced.

Next you replace the ROMs that are fried with compatible EPROMs. You can buy these EPROMs from various websites, forum members, or on eBay. Program the EPROMs with a Willem EPROM programmer PLUS the 16-Bit EPROM adapter that you can buy off of eBay.

Then you desolder the old chips and solder in the replacement ones, double check your work, then plug in the cart to test it.

By the time you buy everything and do all this work it would've probably been cheaper to sell the dead cart and pick up another one off of eBay. BUT, if you fix it then you have some experience that can be used to fix other boards/games too.

RJ

An MVS cart isn't only roms, there are other circuits. On KOF2002 some big quad flatpacks that are more sensitive than mask roms. And you would expect those to be perfectly safe after being supplied with 12v?

if atleast once crc checks alright or the unibios can see the cart those would be alright. my guess

...not to mention that the unibios only checks program roms. KOF02 cart is loaded with 64mb C roms. Besides I'd be curious to know how you'd go about replacing 64mb roms and in a cost-effective way worth the repair job. This thread is so funny at so many levels.

so funny

whatever

What are the extra (non-EPROM) ICs used for? I assume they have to do with decrypting of some sorts.

Probably just some logic to map roms in & out of the memory map when you have massive carts that are larger than the system board allows for...

If they were all encrypted then someone would've had to unencrypt them or work around it for MAME...

Yes, some carts have those chips that can't easily be replaced. That's another reason to list why it would be easier to sell it to someone that wants to fix it just to try to fix it vs. going to eBay and buying another one.

He asked... so he's getting answers. Better to tell him the truth than to be an assclown and just make fun of him. So I missed a part, big deal, it's still more than he's probably willing to do for a cart considering the time and money it would cost to fix.