The Irritating Maze compatibility

[Apocalypse]

I've got the opportunity to grab a set for The Irritating Maze (cart + adapter + trackball).
It's easy to find MV-1B boards but with OG BIOS.
So 2 questions :
- Is the .bin file for the modified (but official) BIOS available somewhere?
- Is there a difference in gameplay by using Raz's Unibios with the trackball on a normal board?
I know there is also a classic joypad compatibility mode with the Unibios but I'd really like to experience the trackball.

 

[Razoola]

The unibios has been tested and using the trackball is the default option with this game.

Raz

 

[Apocalypse]

Thanks Raz. Once again you gave me a perfect answer: Unibios is the key!
I take it you have emulated the functionalities of the specific board (the one that fits between the cabinet and the MVS board) in the Unibios, isn't it?