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RAM Address Length Type Description Details
$7E0041 3 bytes Hardware mirror Window mask settings. These control which window is for which layer active as well as whether a window is inverted for that layer.

Format of each register:
ABCDabcd
where
A/a: Enable window 2
B/b: Invert window 2
C/c: Enable window 1
D/d: Invert window 1

Lower case apply for BG1, BG3 and OBJ (layer 1, 3 and sprites) and upper case apply for BG2, BG4 and COL (layer 2, 4 and colour 0 / fixed colour).

$41 (mirror of W12SEL $2123) controls BG1 and BG2
$42 (mirror of W34SEL $2124) controls BG3 and BG4
$43 (mirror of WOBJSEL $2125) controls OBJ and COL
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