King of the Monsters 2 MVS graphics issue

[stronk]

Hello, first time posting so I hope I am doing this right.

I recently got KotM2 for MVS and unfortunately I have some issues with it. After I got it, I checked everything for authenticity and cleaned the cart really good. Wanted to try the game and got garbled graphics. After another thourough cleaning the game worked fine in the intro and menus but I didn't check ingame because I didn't want to spoil myself (didn't play KotM1 at that point). Now I wanted to play part 2 and the graphics are all over the place again and I can't get it to work no matter what I do. UniBios CRC check fails as well. Every time I run the check it shows a different string. First thought was that one of the P Chips needs a swap but it seems that KotM2 is one of the games that is likely to fail the CRC check, right? I can't check without unibios because I only have one MVS board with unibios and I don't have the original bios. What should be my next step here? Should I just buy an eprom programmer and check the P roms if they are indeed bad or should I first try and get another MVS board without unibios? Maybe you guys can help me with next steps. Kind of lost at this point.

Thanks
stronk

 

[BIG BEAR]

You're going to have to check the C roms on the CHA board.
The P roms are on the PRG board.
BB

 

[Neo Alec]

Since the game is booting, the P roms are probably okay, but I would cover the EPROMs with black tape.

 

[stronk]

You're going to have to check the C roms on the CHA board.
The P roms are on the PRG board.
BB

I will check the C roms then, thank you BB!

 

[stronk]

Since the game is booting, the P roms are probably okay, but I would cover the EPROMs with black tape.

Thanks for the answer, what does the black tape do? I am seeing this all the time but I really don't know what it does. Love your videos by the way!

 

[stronk]

I checked continuity to the C roms on both sides using the graphic below and everything seems fine. I checked the NEO-273 as good as I could as well.

MVS cartridge pinout - NeoGeo Development Wiki

wiki.neogeodev.org

 

[Neo Alec]

Thanks for the answer, what does the black tape do? I am seeing this all the time but I really don't know what it does. Love your videos by the way!

Hey glad you enjoy the videos! See the windows on your two EPROMs there? Those erase the data on the chips when exposed to UV light. Covering the windows protects the data from accidental erasure from light exposure over time.

 

[stronk]

Hey glad you enjoy the videos! See the windows on your two EPROMs there? Those erase the data on the chips when exposed to UV light. Covering the windows protects the data from accidental erasure from light exposure over time.

I see, thanks for the info! I got an eprom reader now but I can't get it to read chips. Took an eprom from a weird street hoop cart that I know works but my program doesn't recognize anything. Have to watch some videos on that. Will update thread when I know what I am doing.

 

[Neo Alec]

I see, thanks for the info! I got an eprom reader now but I can't get it to read chips. Took an eprom from a weird street hoop cart that I know works but my program doesn't recognize anything. Have to watch some videos on that. Will update thread when I know what I am doing.

The reader needs to be set to the correct eprom type.