Changes

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.  Sometimes, 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 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.

{| class="wikitable"

{| class="wikitable"

! Sales Region !! Region Lock !! Region Suffix

! Sales Region !! Region Lock !! Region Suffix

|-

|-

| Japan || Japan || JH, JF

| Japan || Japan || JF, JH, JM

|-

|-

| North America || North America || W

| North America || North America || W

|-

|-

| Middle East / Southeast Asia || North America || S

| Middle East / Southeast Asia || North America || S

|-

|-

| Australia || Europe || AH

| Australia || Europe || AH