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

# txp(4)

3Com 3XP Typhoon/Sidewinder (3CR990) 10/100 Ethernet device

## NAME

**txp** – 3Com 3XP Typhoon/Sidewinder (3CR990) 10/100 Ethernet device

## SYNOPSIS

**txp\* at pci?**

## DESCRIPTION

The **txp** driver provides support for the 3Com Typhoon/Sidewinder Fast Ethernet chipset, including the following:

- 3Com 3CR990-TX-95

- 3Com 3CR990-TX-97

- 3Com 3CR990SVR95

- 3Com 3CR990SVR97

The **txp** driver supports IPv4 receive IP/TCP/UDP checksum offload, IPv4 transmit IP checksum offload, and VLAN tag insertion and stripping.

The **txp** driver supports the following media types:

- **autoselect**

  Enable autoselection of the media type and options. The user can manually override the autoselected mode by adding media options to the appropriate [hostname.if(5)](/hostname.if/5.md) file.

- **10baseT**

  Set 10Mbps operation. The [ifconfig(8)](/ifconfig/8.md) **mediaopt** option can also be used to select either **full-duplex** or **half-duplex** modes.

- **100baseTX**

  Set 100Mbps (Fast Ethernet) operation. The [ifconfig(8)](/ifconfig/8.md) **mediaopt** option can also be used to select either **full-duplex** or **half-duplex** modes.

The **txp** driver supports the following media options:

- **full-duplex**

  Force full duplex operation.

- **half-duplex**

  Force half duplex operation.

For more information on configuring this device, see [ifconfig(8)](/ifconfig/8.md).

## FILES

The driver needs a firmware file, which is loaded on demand when the device is attached:

- */etc/firmware/3c990*

  ## SEE ALSO

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

## HISTORY

The **txp** driver first appeared in OpenBSD 2.9.