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cbus(4/luna88k) NEC PC-9801 extension board slot bus
cbus(4/sparc64) channel device bus

CBUS(4) Device Drivers Manual (luna88k) CBUS(4)

cbus
NEC PC-9801 extension board slot bus

cbus0 at mainbus0

cbus is a bus interface of "NEC PC-9801 extension board slot" (so-called "C-bus" in Japan) on LUNA-88K2. The original LUNA-88K does not have this slot.

The devices currently supported on cbus are:
necsb(4)
NEC PC-9801-86 sound board
pcexmem(4)
NEC PC-9801 extension board slot
pcmcia(4)
PCMCIA (PC Card) support

intro(4)

The cbus bus interface first appeared in OpenBSD 5.7.
March 5, 2015 OpenBSD-current