Hi the_maq,
Well here's what I found out recently:
Asterix titlescreen: on the PCB as the Asterix logo gets squished, it has a horizontal line through it. On current emulation (fb, mame), you'll see vertical lines also. With the new fix I'm working on, it functions just like the PCB.. it's still going to have 1 line for a few frames.
The problem with TMNT2 (turtles in time) is due to an unemulated protection mcu which generates the sprite scaling (to control the sprite size), so most of the sizes are generated algorithmically, but, it's not perfect. It should be an easy fix though once I get to it.
best regards,
- dink