I'm running with Frameskip On (but not "agressive" which can miss some collision detection at the trade-off for more speed).I will retry tonight, can you please tell me if you keep skipframe = ON or OFF and sound settings from your last build ?
In theory frameskip On/Off should make no difference. It doesn't affect frame-to-frame timing - it just doesn't render to the NDS display every other cycle to save CPU time. The inter-frame timing should still be the exact same.
I've played a ton of Buzz Bombers, He-Man and Astrosmash as a kid and those timings on Nintellivision seems spot-on to me. I'm going to run some A-B comparisons on Burgertime from NINTV-DS and a real system soon.
But we'll get to the bottom of it! And we can fix Nintellivision