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

# io(4)

HP PA-RISC I/O subsystem reference

## NAME

**io** – HP PA-RISC I/O subsystem reference

## DESCRIPTION

The following table lists the PA-RISC I/O subsystems and connected devices found in the supported HP 9000/700 machines.

| | | | | | |
| --- | --- | --- | --- | --- | --- |
| **Model** | **MBA** | **SCSI** | **Network** | **Video** | **Misc** |
| 705 | A | SE | DX | Timber |  |
| 710 | A | SE | DX | Timber |  |
| 712 | LW | SE | CA, TR | Artist |  |
| 715/33 | A | SE | DX | Stinger |  |
| 715/50 | A | SE | DX | Stinger |  |
| 715/64 | LW | SE | CA | Artist |  |
| 715/75 | A | SE | DX | Stinger |  |
| 715/80 | LW | SE | CA | Artist |  |
| 715/100 | LW | SE | CA | Artist |  |
| 720 | A | SE | DX | \[SGC\] |  |
| 725/50 | A | SE | DX | Stinger |  |
| 725/75 | A | SE | DX | Stinger |  |
| 725/64 | LW | SE | CA | Artist |  |
| 725/100 | LW | SE | CA | Artist |  |
| 730 | A | SE | DX | \[SGC\] |  |
| 735 | A | SE, FWD | DX, FDDI | \[SGC\] |  |
| 742i | A | SE | CA | Stinger | VME |
| 743i | DLW | SE | DX | Artist | VME |
| 744 | DLW | SE | DX | EG | VME |
| 745 | DLW | SE | DX | EG | VME |
| 745i | A | SE | DX | Stinger |  |
| 747i | A | SE | DX | Stinger |  |
| 748 | DLW | SE | DX | EG | VME |
| 748i | DLW | SE | DX | Artist | VME |
| 750 | A | SE | DX | \[SGC\] |  |
| 755 | A | SE, FWD | DX, FDDI | \[SGC\] |  |
| A180/C | DL | SE | DC | \[GSC/PCI\] |  |
| B132L | DLW | SE, FWD | CA | EG |  |
| B160L | DLW | SE, UW | DC | EG |  |
| B180L | DLW | SE, UW | DC | EG |  |
| C100 | LUW | SE, FWD | CA | \[GSC\] |  |
| C110 | LUW | SE, FWD | CA | \[GSC\] |  |
| C132L | DLUW | SE, UW | DC | EG |  |
| C160L | DLUW | SE, UW | DC | EG |  |
| C160 | DLU | SE, UW | DC | \[GSC/PCI\] |  |
| C180L | DLUW | SE, UW | DC | EG |  |
| C180 | DLU | SE, UW | DC | \[GSC/PCI\] |  |
| C200 | DLU | SE, UW | DC | \[GSC/PCI\] |  |
| C230 | DLU | SE, UW | DC | \[GSC/PCI\] |  |
| C240 | DLU | SE, UW | DC | \[GSC/PCI\] |  |
| C360 | DLU | SE, UW | DC | \[GSC/PCI\] |  |
| J200 | LUW | SE, FWD | CA | \[GSC\] |  |
| J210/XC | LUW | SE, FWD | CA | \[GSC\] |  |
| J280 | DLUW | SE, UW | DC | \[GSC/PCI\] |  |
| J282 | DLUW | SE, UW | DC | \[GSC/PCI\] |  |
| J2240 | DLUW | SE, UW | DC | \[GSC/PCI\] |  |
| RDI | DL | SE | CA | EG | CardBus |
| SAIC | LW | SE | CA | Artist | PCMCIA |

The MBA column denotes the bus adapters in use:

- A

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

- D

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

- L

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

- U

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

- W

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

The trailing characters in the SCSI row denote the SCSI bus configuration:

- SE

  [oosiop(4)](/oosiop/4.md) or [osiop(4)](/osiop/4.md); Symbios/NCR 53C700/710 8-bit (fast) single-ended,

- FWD

  [siop(4)](/siop/4.md); NCR53C720 16-bit fast differential (HVD),

- UW

  [siop(4)](/siop/4.md); NCR53C875 16-bit ultra single-ended.

The trailing digits in the Network row denote the interface speed:

- CA

  [ie(4)](/ie/4.md); i82596CA 10 Mb/s,

- DX

  [ie(4)](/ie/4.md); i82596DX 10 Mb/s,

- DC

  [dc(4)](/dc/4.md); DEC 21142/3 10/100 Mb/s,

- FDDI

  Am78830 Formac+ FDDI.

## SEE ALSO

[asp(4)](/asp/4.md), [dc(4)](/dc/4.md), [dino(4)](/dino/4.md), [gsc(4)](/gsc/4.md), [ie(4)](/ie/4.md), [intro(4)](/intro/4.md), [lasi(4)](/lasi/4.md), [oosiop(4)](/oosiop/4.md), [osiop(4)](/osiop/4.md), [runway(4)](/runway/4.md), [siop(4)](/siop/4.md), [sti(4)](/sti/4.md), [uturn(4)](/uturn/4.md), [wax(4)](/wax/4.md)

## HISTORY

The hppa **io** reference first appeared with OpenBSD 3.3.