---
name: "aplnco"
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/aplnco"
---

# aplnco(4)

Apple NCO clock controller

## NAME

**aplnco** – Apple NCO clock controller

## SYNOPSIS

**aplnco\* at fdt?**

## DESCRIPTION

The **aplnco** driver controls the numerically-controlled oscillators that are used to derive the audio clock signals for Apple SoCs.

## SEE ALSO

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

## HISTORY

The **aplnco** device driver first appeared in OpenBSD 7.1.

## AUTHORS

The **aplnco** driver was written by Mark Kettenis ⟨*kettenis@openbsd.org*⟩.