Jumping issues

[+atari2600land]

OK, this is really a dumb problem I'm having that I shouldn't be having.

In this picture, frame counts 293 and 294 have exactly the same scanline count, and does not jump in Stella, but it does on a real Atari 2600. WHY? I've tried all sorts of things to not make it do this, none of which worked, and I've ran out of patience.

nosehair19a.asm nosehair19a.bin

[Mr SQL]

12 hours ago, atari2600land said:

In this picture, frame counts 293 and 294 have exactly the same scanline count, and does not jump in Stella, but it does on a real Atari 2600. 

Try a Darker shade of Blue for your COLUBK or COLUPF background, does the problem go away?

I had a similar issue and this resolved.

12 hours ago, atari2600land said:

WHY?

No idea I would like to know too! 

 

[+atari2600land]

It got a little better but it didn't completely go away.

 

[+atari2600land]

OK, this is really stupid. I worked some more on this. And even though the scanline counter drops to 261 at the same place, the picture is still steady at 262 on both Stella and a real Atari 2600. What is going on here?!

 

nosehair19b.bin nosehair19b.asm

[+atari2600land]

Tried it again, and the jumping came back, on the same program. On the same spot.

[Mr SQL]

7 hours ago, atari2600land said:

It got a little better but it didn't completely go away.

 

Very cool, does it go away completely if you make it an even darker blue or dark black?