Thomas Jentzsch

Good analysis! So parameters with wrong arguments are simply skipped and the other options and arguments are processed, correct? IMO Stella should stop at the first wrong option or parameter...

I don't know if anyone ever fully understood this, sorry. Players behave the same, see the StarsEffect ROM.

For me it does 

I stand corrected, no wobbling for players in current Stella. But on real hardware, they all wobble.

I wish I could. After creating the binary I played with it (long ago) and broke something. So it may take a while until I have reverted those changes. BTW:...

Recreated the ROM by using DiStella. The attached version allows some control over horizontal movement with left and right difficulty switches. BTW: The code doesn't use P0 but the ball...

OK, I tested on real hardware (PAL Darth Vader): With each horizontal pixel, the width for BL and Mx changes like this: 1, 2, 3, 2... The player is slightly...

I made some experiments: 1. missiles, balls and players seem to behave (more or less) the same 2. as soon as the objects are at least 4 pixel wide, they...

Yes, 4 consecutive single width pixel. Or 2 double width consecutive pixel or 1 quad width pixel.

Cosmic Ark works like the old core now. All stars are currently only 1 or 2 pixel wide, while my StarsEffect demo displays 1, 2 or 3 pixel wide ones....