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Color Math
From SnesLab
Color Math includes hardware transparency and other effects. The official terminology is "screen addition" and "screen subtraction."
The "SW" in "Main SW" and "Sub SW" stands for "switch."[1]
Color math is not available in Mode 5 nor Mode 6.[2]
Reference
- page 2-27-16 of Book I of the official Super Nintendo development manual
- https://problemkaputt.de/fullsnes.htm#snesppubgcontrol