Even raster games don't show scanlines when turn them off but vector games still do.
If you can turn them off for raster games, you should be able to do the same for vector games.
Yes I tried shutting them off in the vector.ini and MAME.ini but they still appear.
There are other .ini files like horizontal.ini that could be the issue.
Have you tried making a game-specific .ini? (asteroid.ini)
- The game-specific .ini is the last one that MAME reads and those settings override the ones from higher level .ini files like mame.ini, horizontal.ini, vector.ini, etc.
- You can make a game-specific .ini by renaming a copy of the mame.ini file and editing the contents as desired.
- You can delete any lines in asteroid.ini that are unchanged from mame.ini and are
obviously not relevant. (paths, directories, input options, debugging, etc.) Removing the obviously irrelevant parts should make it easier to find something that may have been overlooked.
Scott