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Ethernet MAC IDs
The MAC ID of the first NIC on all PC Engines boards is derived of its serial number. The following NICs have subsequent addresses.

This is the formula to convert from MAC ID to serial number and vice versa:

MAC ID = 00:0d:b9 (our OUI) : (serial + 64) * 4

serial = (MAC ID & 0x000000FFFFFF) / 4 - 64

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