The card appears to be 10BaseT as is the Onboard NIC. If they were very common that means they are likely to be supported under Linux / BSD, which is probably all I need to know about it... =)

Happy Meal Ethernet (hme), so called because you got the ethernet and the scsi all in one package.

There was also their 100meg card, which was "Big Mac" for obvious reasons. One of these days I have a Big Mac card to go in my SunOS 4.1.4 machine, and I should do that. Sigh. One of these days I should retire it.