Kaneko Super Nova error B - NG

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My Cyvern stopped booting up today and I was pretty meh about it. Finally cleaned all the contacts and reseated it nice and tight and it gets to the self-check and says "A - OK B - NG". After that it gets to the warning screen and scrambles about the screen until it resets and does the same thing again.

I'm assuming one of the 2 eproms on the cart went bad? Does anyone know which eprom is A and which one is B?

[thechop]

Have you changed the battery ?

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Have you changed the battery ?

Yes. It actually wouldn't even get this far before changing the battery.

[thechop]

Oh right, I just recall having some probs when the battery needed changing, been a while tho, its not this type of board that needs the test button holding down on the board to reset something is it after a bios/battery change?
Don't try it tho unless someone can confirm as I'm very prob wrong, been to bed since then.

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Oh right, I just recall having some probs when the battery needed changing, been a while tho, its not this type of board that needs the test button holding down on the board to reset something is it after a bios/battery change?
Don't try it tho unless someone can confirm as I'm very prob wrong, been to bed since then.

I read what you wrote and that sounded familiar, so I tried it. The game still says B - NG but it will play the entire game SUPER glitchy and weird. I'm assuming one of the roms is messed up. Ordered the pair and now just need to figure out which goes in which spot.

[skate323k137]

Guessing you don't have an eprom burner? You could dump the rom(s) to see which is which. If at least one on the board is good, it's an easy task (well, if they're in sockets anyway)

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Guessing you don't have an eprom burner? You could dump the rom(s) to see which is which. If at least one on the board is good, it's an easy task (well, if they're in sockets anyway)

Yeah, unfortunately mine got a nasty case of energy drink spilled in it the last time I moved cross-country. Cleaned it out before plugging it in, still never worked again.

They're socketed, so that's good for sure. I just ordered both u10 and u8 and will replace them in that manner rather than try to figure out which the rom check sees as A and which it sees as B.

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Figured maybe this is worth bumping.

Finally got back to messing with it today. I've ensured the voltages are right, and cleaned both the cart, and motherboard connectors.

Not sure what SuperNova boards check on startup, but my A is OK and my B is NG.

It flickers oddly and will go through the only use in Japan, then the SuperNova splash, and restart telling me that A is OK and B is NG. Over and over.

I took a wild guess that A or B may be the two socketed program roms (U8 and U10) and replaced them with newly burned ones to no avail.

I tried messing around in MAME and "corrupting" different ROMs by writing garbage to them to try and get MAME to tell me that A or B were NG, but that doesn't work. It does make for some REALLY neat graphic and audio issues though!

Anyone know what A or B are? RAM, maybe?

[Asayuki]

What if A and B are boards, like it is on CPS2? Can you try another cart?

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What if A and B are boards, like it is on CPS2? Can you try another cart?

The SuperNova motherboard manual states that if A-D checks come up they're checking the cart. With that knowledge I'm assuming it's checking ROMs. But there are way more than 2 ROMs on the cart, so I'm not really sure...

I don't own any other carts, unfortunately. T_T. I'd have picked up a few Gals Panic carts by now if I ever found them sold without a motherboard.

[Asayuki]

Ok, no clue then. Very wild guess: there also are gals on the cart if i'm not wrong, maybe two of them. Does removing one change the error message?

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Ok, no clue then. Very wild guess: there also are gals on the cart if i'm not wrong, maybe two of them. Does removing one change the error message?

That was an excellent guess. There are indeed 2 gals on the cart.

Removing one causes the game to not boot at all though, unfortunately.