SBus —
introduction to machine-independent SBus bus support and
  drivers
sbus* at mainbus?
sbus* at iommu?
sbus* at xbox?
These
  
    | SBus | attachments are specific to the NetBSD/sparc and
      NetBSD/sparc64 ports. | 
SBus is a I/O interconnect bus mostly found in SPARC
  workstations and small to medium server class systems. It supports both
  on-board peripherals and extension boards. The SBus
  specifications define the bus protocol as well as the electrical and
  mechanical properties of the extension slots.
NetBSD includes machine-independent
  SBus drivers, sorted by device type and driver name:
  - esp(4)
- NCR53c94 and compatible SCSI interfaces.
- isp(4)
- Qlogic SCSI interfaces.
 
  - le(4)
- Lance 7990 series Ethernet interfaces.
- hme(4)
- “Happy Meal” Ethernet interfaces.
- be(4)
- “Big Mac” Ethernet board.
- qe(4)
- Quad Ethernet Controller board.
 
  - magma(4)
- Magma Serial/Parallel combo device.
 
The machine-independent SBus subsystem appeared in
  NetBSD 1.3.