IBUS(4) Device Drivers Manual (pmax) IBUS(4)

ibus
pmax internal I/O space driver

ibus0 at mainbus0
ibus0 at tc? slot ? offset ?

ibus is a virtual device corresponding to the pmax internal I/O space found on DEC 2100, 3100, 5100 and 5000/200 systems.

Internal I/O space spans the pmax physical address space, and is mapped permanently in the kernel virtual space at the very early time of the kernel startup procedure.

ibus driver manages the internal I/O space of pmax.

ibus is always required to run the NetBSD kernel.

pmax/intro(4), bus_dma(9), bus_space(9)
February 17, 2017 NetBSD 9.4