Most of all you want to have the data updated before it get's
visible on the screen
Or any time AFTER the sprite is drawn but before it is drawn again, which
yeilds a heck of a lot more available time than HBLANK if the sprite is on
the left half of the screen, although I guess it would yield an unusable 1st
scanline unless you had some specialized code for the 1st line to jam it in
there.
BTW, does anyone know of any other games that seem to exhibit a tearing
effect or missing scanline effect due to inopportune GRPx writes? Motorodeo
comes to mind. I don't know what's going on in that game but it's something
strange. It's got like a phantom scanline or something.
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