Marvel Super Heroes - Missing level musics and figuring out replacement eprom

[jammajunk]

Hey guys,

I picked up a Marvel Super Heroes boardset, it seemed like it worked fine but it's missing music on some stages, I tried the B board with 3 differents A board, and the problem is still there, with the same problems on the same stages.

Now, I was searching forums and found this post: https://www.arcade-projects.com/thr...tion-are-they-interchangeable.3587/post-49034

• Sound program (01-02) can be 27c1001 or 27c010
• Qsound sample (11-12) can be 27c160 or 27c322

According to the test mode, rom 01-02 are OK. Playing some more, I noticed that certain stages with problems have "partial" music playing, like just the drums, or some weird synth-ish sound. Logically, this should be contained in the Qsound sample roms, so position 11-12

Doing some more research, i found this info about those position:

msh.11m	2.00 MB
msh.12m	2.00 MB

also, according to the Arcade Otaku wiki:
16 megabit / 2048kb / 8 or 16 bit

42pin DIP package

• 27c160

This seems like it should be the fitting eeprom replacement. Or am I wrong?

​

 

[ekorz]

That’s a fine replacement. Also MX291615 for a flash version in a pdip that better matches the original. These are socketed so you have two quick/easy diagnostic options if you want to try them. If you have a programmer, you can just pull the roms and verify them. If not, you can do is pull them out one at a time and run the game with each empty socket. That way, if one was bad, you'd basically hear no difference when that one was pulled.

 

[jammajunk]

Thanks for the reply.

I just pulled the roms and verified them with my programmer, and they were all fine. I cleaned the legs of the chips, the sockets, and it still does the same. It's such an odd problem. The music plays fine when you choose your character and all that, and as soon as it loads Iron man's stage, it stops, and we only hear the combat sounds and voice. Hmm!

 

[ekorz]

Well you could still test pulling out one rom at a time to narrow things down. In mame if I blank 11m for example it does cut out a lot of stage music, but leave in some drums and synth. Otherwise if you have a logic probe you can make sure the enable lines are running and that all the addressing & data lines are firing. You might have a broken trace or a cold solder joint and if you can't see if visually your logic probe would find the line disconnected.

 

[jammajunk]

I'm going to get a logic probe then. Seems like it's the next step.

I was also wondering about this, I wonder if my board has not been altered by the previous owner.

First, the 01-02 roms are from two different brands. Could be.. just a coincidence. Also the jumpers kinda feel .. botched. It would be weird for an untouched board.

My motherboard is a 93646B-7 revision. Looking on google, i have also found a picture of a revision 7 Marvel Super Heroes US board running with a different jumper settings for jp8 to jp13

This is my board, its a japanese version:

This is from another poster on this forum with a rev 7 motherboard:

But then again, looking at the jumper_data_settings.xls file (from the conversion guide on this forum), I see this:

As we can see from my own board, my sequence is OSOOOO instead of OSSOSO

Could this different jumper configuration affect the sound? This set of jumper is closed to the audio roms.

I do remember reading posts from users here with certain scrambled graphics when doing conversions, until they changed those jumper settings.

 

[ekorz]

Grab a multimeter and test for continuity; you can’t tell your jumper config for sure just by the solder blobs. There are wire traces connecting some.