The guys from our https://dcemulation.org/chat.htm have today released TMNT Unofficial MAMEDC v0.2, the guys in particular namely HyperG, Debeauter and Mr Siggler have done very well, heres some news about it straight from the https://dcemulation.org/phpBB/viewtopic.php?t=11404 :

Alright, we’re not the ones who coded unofficial MAME, Sisei hacked together a nice working unofficial MAME. Thanks to him for that!
However, not everything works, so more things needed changing within the driver/tmnt.c file . Delt with video of course.
This release fixes where the screen is, however we’re still not done with it as we’re not completely happy how it looks. Hopefully tomorow the final one will be done with, so you could play TMNT on your sega dreamcast happily.

Very cool news that.