Tip: Press F2 on the level editor to see subscreen boundaries. This will help you avoid glitching dragon coins by putting them on the subscreen boundaries.
Last X/Y value of layer 1 where VRAM upload of Map16 tiles was performed when scrolling left/up.
The low 4 bits are forced to zero (AND #$FFF0) in order to get scroll values on a 16 pixel boundary.
It is used to determine if a VRAM update is necessary during scrolling.
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