---
name: "sbus"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/sbus"
---

# sbus(4)

introduction to SBus bus support

## NAME

**sbus** – introduction to SBus bus support

## SYNOPSIS

**sbus\* at mainbus?** **sbus\* at xbox?**

## DESCRIPTION

These **sbus** attachments are specific to the sparc64 port.

**sbus** is an 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.

OpenBSD provides support for the following devices. Note that not all architectures support all devices.

### Audio interfaces

- [audiocs(4)](/audiocs/4.md)

  SPARC CS4231 audio device

### SCSI interfaces

- [esp(4)](/esp/4.md)

  ESP NCR 53c94 on-board or SBus SCSI interface

- [qla(4)](/qla/4.md)

  QLogic ISP2100/2200/2300 Fibre Channel controller

- [qlw(4)](/qlw/4.md)

  QLogic ISP1000/1020/1x40/1x80/1x160 SCSI controller

### Network interfaces

- [be(4)](/be/4.md)

  SPARC 10/100 Ethernet device

- [gem(4)](/gem/4.md)

  GEM 10/100/1Gb Ethernet device

- [hme(4)](/hme/4.md)

  Sun Happy Meal 10/100 Ethernet device

- [le(4)](/le/4.md)

  AMD LANCE Ethernet device

- lebuffer(4), ledma(4)

  AMD LANCE Ethernet device

- [qe(4)](/qe/4.md)

  SPARC 10/100 Ethernet device

- [qec(4)](/qec/4.md)

  SPARC Quad Ethernet Controller

- [ti(4)](/ti/4.md)

  Alteon Networks Tigon I and II Gigabit Ethernet device

### Bridges

- [stp(4)](/stp/4.md)

  SBus PCMCIA bridge

### Graphics devices

- [agten(4)](/agten/4.md)

  Fujitsu AG-10e accelerated 24-bit color frame buffer

- [bwtwo(4)](/bwtwo/4.md)

  Monochromatic frame buffer

- [cgsix(4)](/cgsix/4.md)

  Accelerated 8-bit color frame buffer

- [cgthree(4)](/cgthree/4.md)

  8-bit color frame buffer

- [cgtwelve(4)](/cgtwelve/4.md)

  Accelerated 24-bit color frame buffer

- [mgx(4)](/mgx/4.md)

  SMS MGX and MGXPlus accelerated 24-bit color frame buffers

- [rfx(4)](/rfx/4.md)

  Vitec/Connectware/AP&D RasterFlex framebuffer series

- [tvtwo(4)](/tvtwo/4.md)

  Accelerated 24-bit color frame buffer

- [vigra(4)](/vigra/4.md)

  8-bit SBus color frame buffer with VGA-compatible modes

- [zx(4)](/zx/4.md)

  Accelerated 24-bit color frame buffer

### Serial and parallel interfaces

- [apio(4)](/apio/4.md)

  Aurora Technologies pio1 parallel port card

- [asio(4)](/asio/4.md)

  Aurora Technologies pio2 serial port card

- [bpp(4)](/bpp/4.md)

  parallel port

- [magma(4)](/magma/4.md)

  Magma LC series Serial/Parallel Interface cards

- [spif(4)](/spif/4.md)

  Sun Serial/Parallel Interface card

- [zs(4)](/zs/4.md)

  Zilog 8530 (ZSCC) serial communications driver

### Miscellaneous devices

- [auxio(4)](/auxio/4.md)

  Miscellaneous I/O controls

- [clock(4)](/clock/4.md)

  real-time clock

- [fdc(4)](/fdc/4.md)

  NEC765 compatible floppy disk driver

- [uperf(4)](/uperf/4.md)

  Performance counters on the host bridge

- [xbox(4)](/xbox/4.md)

  SBus Expansion subsystem

## SEE ALSO

[intro(4)](/intro/4.md)

## HISTORY

The machine-independent **sbus** subsystem appeared in NetBSD 1.3. OpenBSD support first appeared in OpenBSD 2.0.