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;; we are constantly polling it and filling it, the value will move constantly).
;; - $21: the previous status of the right arrow.
;; - $42: the counter which is incremented on each press of the right arrow button.
+;;
+;; Whenever you are done with this example, hop into the `shared/joypad.s` file,
+;; which brings some other considerations when reading from controllers. That
+;; is, the algorithm shown below is not entirely "safe" due to a hardware bug
+;; which might give unreliable inputs on some spikes.
;;;
;;;