I wrote:
>Then P0 and P1 are scrolled 1 pixel every N frames (where N determines scroll speed), with a hard scroll of the Playfield and resetting of P0/P1 every 4th scroll.
Actually, P0/P1 are reset every 32 scrolls (every 8th hard scroll). Which is why the hills are somewhat simple, you need 32 pixels (8 Playfield pixels) between any change in elevation.
Chris...
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