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Super Scope
From SnesLab
The Super Scope is a gun-shaped lightpen-based device which can be aimed at the screen. It is not sensitive to red due to its long raster florescent time. It has a SM595 cpu.
The Super Scope receiver is plugged into the second controller port.
References
- Datasheet for the 4021 shift register: https://www.ti.com/lit/ds/symlink/cd4021b-q1.pdf
- https://snescentral.com/article.php?id=0017