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Applying the algorithm, we get ((3 * 21) + 19) % 10 = 2, matching the example's check digit.

Applying the algorithm, we get ((3 * 21) + 19) % 10 = 2, matching the example's check digit.

The letter prefixes are a letter specifying the device, followed by one a letter specifying the region in which it was sold.  In some regions, a third letter is present; a current guess is that this letter distinguishes among factories for a given sales region.  Note that several different sales regions' console may be considered to be the same region for region-locking purposes, such as Europe and Australia.

The letter prefixes are a letter specifying the device, followed by one letter specifying the region in which it was sold.  In some regions, a third letter is present; a current guess is that this letter distinguishes among factories for a given sales region.  Note that several different sales regions' console may be considered to be the same region for region-locking purposes, such as Europe and Australia.

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