Dennis wrote:
> These three routines are in overscan. When I moved the ladder checking to vertical blank the ladder problem went away but I still got the problem when the sound was played because that routine is still in overscan.
Hm, hard to tell, the subroutines called are missing.
> BTW, when I switch to using the PAL option (player 1 difficulty set to A) I don't see the problem.
That sounds like a timing problem, as if in NTSC mode, you don't have enough time to do the calculations. Try playing with the timer values. If that doesn't help, I would need full source.
> Also Z26 reports the correct number of scan lines each frame. I'm lost as to what the problem could be here.
Did you try on other emulators?
Have?fun!
Thomas
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