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Thanks for the information shootthecore. The adaptors are awesome, but way too expensive (and just for troobleshooting one board). I'll try to buy a working A board for that price. I'll test the Drams (which I think are the ones responsible for the sprites) from underneath and check anything...

THis is typical from boards from Aliexpress, and shouldnt affect if the NEO-BUF replaced are in these locations: https://wiki.neogeodev.org/index.php?title=NEO-BUF

Hi, I've been using my SFII' board for a long time, and suddenly, now the board shows vertical lines on sprites and on other items (like the health bar). I discard a broken trace or anything similar because I haven't manipulated the board for a long time. Also, I have a working SFII board...

I disabled the stock bios lifting the pins as per NBM guide. So, yes To make the VMC work you shouldnt do anything special. You just disable the stock bios, you insert the VMC on top of the 68k, and you 're done. I really don't know why it is not working for you. Actually they are (even...

I too got a clone of a vmc (mine from AliExpress, using Altera Max chip), indicating it was for Mv1B and mv1c. The vmc works fine in a Mv1B, but when trying it in a mv1a, it showed this write protected message, and did not work. Not a solution of your problem, but wanted to mention it. Have you...

https://www.neo-geo.com/forums/index.php?threads/mv1a-not-playing-specific-games.269392/ Worth a try My board had the same issue. After selecting a game in the menu of the 161 cart, it freezed. All other games worked fine (except metal slug 3) The problem was a bad solder on a resistor

Last batch of VMC (that I'm aware of) were sold at https://www.arcadeworks.net/ But haven't seen stock for a long time the link does not work for me I have also been looking for a VMC for a long time

Thanks Alec, I already did this the first thing (I used a contact cleaner similar to deoxit), but it's as BB says, I've tried using a daughter board from another working MV1B, and the problem remains. And viceversa, the main board of the working MV1B with the daughter board of the faulty MV1B...

Yes, all my originals carts (including the MS3) and also the 161 cart play fine (without the message) in my other MV1B and other boards I have (MV1A, MV1T and MV2F). The problem occurs only with this specific MV1B board. I don't own an original Sengoku 3 o Matrimele, but seeing that these...

yes, no changes :cry:

Yep, the screen from my last post is using the test cart to test the Z80. And I hear 6 bips, corresponding to 001100, which according to smkdan site is a "Z80<->68k COMM. ERROR (DATA)" So my guess now is that the NEO-SDR (acts as intermediate between z80 and 68k) is faulty, and that would mean...

The MS3 cart should not be the problem, since it works perfectly in my other MVS boards. And additionally, when playing MS3 in the 161 cart it also shows this error, so I think it's definitely the main MV1B board. I've checked again with diag bios and z80 testing (while pressing B & D), and I...

Understood, but I've used another mv1b upper board (from another fully working mv1b board), and I still have the problem. Anyway, I've thoroughly cleaned the cart slot and the main/upper board connectors, no difference. I'm rather convinced it's not a problem with the cart slot or the...

I have an original MV1B that when booting some specific games, it shows the following message: MVS SLOT CHECK VER2.20 99/11/01 M1-ROM ERROR This is the error I get with my original Metal Slug 3. The exact same message appers on MS3 when using the multicart 161 in 1. After this message, the...

Confirmed, it was the YM3016 😃

I have a board that doesn't output audio. Well that's not strictly true, because in some games I still hear very specific sounds, like in metal slug, when I grab a jewel or apple, I hear the sound. I have concentrated on chip YM3016D, the DAC. https://wiki.neogeodev.org/index.php?title=YM3016...

This replacement works fine, I've used it https://github.com/mourix/CRE401

Have you tried to put a diag bios to check if it reports any specific error? http://smkdan.eludevisibility.org/neo/diag/

you'll might get around that error and play games, but the backup ram system won't work worth a try

You have a problem with the upper Backup RAM. You need to check the traces going from/to that IC, see if there is any broken trace. MOst likely if your old battery has leaked. It might be also a bad chip. If so you'll need to replace that IC (32K x 8bit SRAM). Or it's often the 74HC32 close to...