---
name: "asms"
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/asms"
---

# asms(4)

Apple sudden motion sensor

## NAME

**asms** – Apple sudden motion sensor

## SYNOPSIS

**asms\* at iic?**

## DESCRIPTION

The **asms** driver provides support for the Apple sudden motion sensor found in some laptops.

The sensors currently exposed via the [sysctl(8)](/sysctl/8.md) interface are:

| | | |
| --- | --- | --- |
| **Sensor** | **Units** | **Typical Use** |
| X\_ACCEL | Unknown | X Acceleration |
| Y\_ACCEL | Unknown | Y Acceleration |
| Z\_ACCEL | Unknown | Z Acceleration |

## HARDWARE

Machines supported by the **asms** driver include:

- PowerBook5,6

- PowerBook6,7

- PowerBook6,8

## SEE ALSO

[iic(4)](/iic/4.md), [intro(4)](/intro/4.md), [sensorsd(8)](/sensorsd/8.md), [sysctl(8)](/sysctl/8.md)

## HISTORY

The **asms** driver first appeared in OpenBSD 3.9.

## AUTHORS

The **asms** driver was written by Xavier Santolaria ⟨*xsa@openbsd.org*⟩.