Sorry to post yet again, but a question for the experts could be: Is the
problem be due to hitting RESPx too early? It seems to be happening in the
HBLANK region (cycle 21) when the value is less than 15.
>Adding a "nop" to it seems to fix it. So the new routine looks like
>this:
>
>bzoneRepos
> sta WSYNC ; 00 Sync to start of scanline.
> sec ; 02 Set the carry flag so no borrow
>will be applied during the division.
>
> NOP ;THIS NOP SEEMS TO PREVENT A STUTTER AT 15 PIXELS
>
>.divideby15
> sbc #15 ; 04 Waste the necessary amount of
>time dividing X-pos by 15!
> bcs .divideby15 ; 06/07
>11/16/21/26/31/36/41/46/51/56/61/66
>
> tay
> lda fineAdjustTable,y ; 13 -> Consume 5 cycles by guaranteeing
>we cross a page boundary
> sta HMP0,x
>
> sta RESP0,x ; 21/ 26/31/36/41/46/51/56/61/66/71 - Set
>the rough position.
> rts
>
> It does it in both Stella and z26. Does the problem that I'm seeing
>exist on real hardware, too? Or am I "fixing" something to run in the
>emulators that will break on hardware? I searched the archive for
>"bzoneRepos", but I didn't find any discussions on this routine.
>
>Thanks!
>
>-Rich
>
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>
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