Item M92 Major Title 2 > Ninja Baseball Batman conversion help

[bartre]

Hey all,

I'm working on a ninja baseball batman conversion from major title 2 and I'm running into 2 issues-
The game crashes (black screen) when I coin up with either the slot or service button
The game freezes at the ram/rom check when I change dip settings.

I've verified all my roms
Dip settings are currently exactly as detailed in this thread for a stock NBB
https://www.arcade-projects.com/threads/irem-m-92-jumper-settings-for-games.4612/

Any help would be appreciated!

 

[bartre]

More troubleshooting -
Reset jumpers and replaced original roms, major title 2 still working as intended
Placed patched roms back and swapped only jumpers J8 to 4M and J16 to 4S

Issue persists
Current jumpers-
Mother
J1 - open
J2 - 16K (per trace on underside)
J3 - B

Rom
J1 - S
J2 - OT
J3 - 4.8M
J4 - OT
J5 - OT
J6 - A
J7 - OT
J8 - 4M
J9 - OT
J10 - 512
J11 - 64K
J12 - OT
J13 - OT
J14 - OT
J15 - OT
J16 - 4S
J17 - Open
J18 - OT
J19 - 2(middle)
J20 - 2S
J21 - 8M
J22 - 4.8M
J23 - OT
J24 OT

 

[XtraSmiley]

I don't know how to do this conversion, but I have one that has been done. Can I help with some pictures?

 

[bartre]

That would probably help; but I'm suspecting a rom issue.
I went through and swapped each jumper one by one, but each change made things worse

 

[ekorz]

That would probably help; but I'm suspecting a rom issue.

Try 4 new roms for the main program. Everything else shouldn’t matter for just booting it up. https://github.com/mamedev/mame/blo...f3ea67aa57aecd19a/src/mame/irem/m92.cpp#L2169

 

[Sbarb18]

Hi. You ever get this working? I’m thinking about doing a conversion as well.

 

[Large Kro]

I bought my Ninja Baseball Batman (jp vers) from Fujita in 2005. It might probably be a factory conversion by Irem from another game rom board since it has the seal of the game on the rom board and not on the mother board. Plus many bridge wires on the rom board.
I ain’t got much knowledge about the different M92 rom boards but if a picture of mine could help to compare with your Major Tilte 2 and see if those bridges could help or not leave me your email adress in PM

 

[ForestOfDreams]

If you could document your jumpers for the conversion that would be incredibly helpful.

 

[Large Kro]

Hi. Sorry for the late reply.
Will be back home soon and make a few pictures of both boards

 

[Large Kro]

Hi. Sorrry for the late reply

Here are pictures of my rom board where jumpers are located

I hope this could help…