---
name: "psycho"
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/psycho"
---

# psycho(4)

SPARC64 Host/PCI bridge

## NAME

**psycho** – SPARC64 Host/PCI bridge

## SYNOPSIS

**psycho\* at mainbus0** **pci\* at psycho?**

## DESCRIPTION

The **psycho** device provides support for the [pci(4)](/pci/4.md) bus on sparc64 systems, most often found on UltraSPARC I and UltraSPARC II based systems. It supports the [ioctl(2)](/ioctl/2.md) interface in [pci(4)](/pci/4.md).

## SEE ALSO

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

## HISTORY

OpenBSD support for the **psycho** first appeared in OpenBSD 3.0.