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→8 bit checksum on MAC address: new section
:Over a year later, but "nigaoe" is something like "portrait", and my guess is that "NR" is "no Revolution". Basically something like "Wii Portrait(s)". - [[User:Vague Rant|Vague Rant]] 09:45, 31 October 2010 (CET)
:Over a year later, but "nigaoe" is something like "portrait", and my guess is that "NR" is "no Revolution". Basically something like "Wii Portrait(s)". - [[User:Vague Rant|Vague Rant]] 09:45, 31 October 2010 (CET)
== 8 bit checksum on MAC address ==
As I can't find if the checksum has been discovered or not, and since it isn't any of the common ones out there, I have studied it for some time; my findings are as follow:
The lower 4 bits of the checksum seems to be equal to the sum of the last 4 bits of the 3 bytes. On overflow, the overflowed amount is added to the upper 4 bits of the checksum.
The upper 4 bits of the checksum seems to be equal to the sum of the upper 4 bits of the 3 bytes, but:
- If the sum of the 4 upper bits of the 3 bytes are > 8, then it cuts the value down to less than 8. In other words, seems to do %8.
- The last 4 bits' overflow are taken into consideration for cutting the value down of the 4 upper bits sum.
Right now, this doesn't explain how valid numbers like C2 can be generated.