Despite the completely different architecture, it's interesting to note the similarities with a standard PC; I'm sure many others here have seen "CMOS checksum

Despite the completely different architecture, it's interesting to note the similarities with a standard PC; I'm sure many others here have seen "CMOS checksum error" messages from the latter before. On the other hand, the most surprising difference is that the MAC address appears to be stored there too, along with other data like manufacturing date that I wouldn't expect to be in anything but a ROM or perhaps E(E)PROM.