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SMW Memory Map

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RAM Address Length Type Description Details
$7E1446 2 bytes Sprites Layer 1 X speed used in the scrolling codes.
#$0001-#$7FFF = move left; #$8000-#$FFFF = move right. #$0000 means there is no movement.
Effectively, it's the X speed to give the player when they're touching the side of a screen, during a level which does not have regular Layer 1 scrolling. Values are different depending on the type of (auto-)scroll.
This value divided by #$10/#16 is stored into $7E:007B.

Additionally used during the castle destruction cutscenes for various purposes. $1446 is used in Morton/Roy's scenes to show the huff cloud at the end and as the Y position of the broom in Wendy's scene.
$1447 is used in Ludwig's scene as the vertical speed of the castle as well as a counter for the dust animation when it hits the hill, and in Larry's as the vertical speed of the castle as well as a timer for when it crashes.
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