controller
https://www.nesdev.org/wiki/Controller_reading_code
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https://www.nesdev.org/wiki/Controller_reading_code
| bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|
| button | A | B | Select | Start | Up | Down | Left | Right |