mainbus - Mac68k main processor bus device
mainbus0 at root
obio0 at mainbus?
nubus0 at mainbus?
The mainbus interface serves as an abstraction used by the
system to help find and attach busses (e.g. the NuBus
or devices connected to the Macintosh main processor bus.
The mainbus first appeared in NetBSD 1.2.
OpenBSD 3.6 July 2, 1997
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