---
name: "mc"
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/mc/4"
---

# mc(4)

Am79C940 (MACE) on-board Ethernet device

## NAME

**mc** – Am79C940 (MACE) on-board Ethernet device

## SYNOPSIS

**mc\* at macobio?**

## DESCRIPTION

The **mc** interface provides access to a 10 Mb/s Ethernet network via the AMD Am79C940 (MACE) Ethernet chip set.

The **mc** interface supports the on-board Ethernet of most old world Power Macintosh systems.

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

- Power Macintosh 7600, 8500, 9500 and 9600.

## SEE ALSO

[arp(4)](/arp/4.md), [ifmedia(4)](/ifmedia/4.md), [inet(4)](/inet/4.md), [intro(4)](/intro/4.md), [macobio(4)](/macobio/4.md), [netintro(4)](/netintro/4.md), [hostname.if(5)](/hostname.if/5.md), [ifconfig(8)](/ifconfig/8.md)

## HISTORY

The **mc** driver first appeared in OpenBSD 4.1.

## AUTHORS

The **mc** Ethernet driver was written by Dave Huang.