---
title: "Uthernet II Ethernet card for the Apple II series"
url: "https://maker.wiznet.io/WIZnet/resellers/uthernet-ii-ethernet-card-for-the-apple-ii-series/"
markdown_url: "https://maker.wiznet.io/WIZnet/resellers/uthernet-ii-ethernet-card-for-the-apple-ii-series/md"
type: "VAR: Value-Added Reseller Products"
author: "Uthernet"
author_url: "http://a2retrosystems.com/"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "Uthernet"
original_url: "http://a2retrosystems.com/"
published: "2023-04-25"
language: "en"
hardware: ["WIZnet W5100"]
likes: 0
views: 216
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# Uthernet II Ethernet card for the Apple II series

> Uthernet II Ethernet card for the Apple II series

Original author: Uthernet (source: http://a2retrosystems.com/)

## Components

- **WIZnet W5100** x 1 ([docs](https://docs.wiznet.io/Product/Chip/Ethernet/W5100))

## Article

**DETAILS**

The Uthernet II is built around the Wiznet W5100 Ethernet controller. The W5100 is “a full-featured, single-chip Internet-enabled 10/100 Ethernet controller” that includes a built-in TCP/IP stack and 16KB internal buffer for data transmission.

**Features**

• Support for TCP, UDP, ICMP, IPv4, ARP, IGMP, and PPPoE

• 10BaseT/100BaseTX Ethernet, PHY embedded •

• Auto Negotiation (Full-duplex and half duplex)

• Auto MDI/MDIX

• 4 independent sockets

• Internal 16KB Memory for TX/RX buffers

• Interrupts (IRQ)

• Built-in support for TCP/IP protocols

• Operated in MAC Raw mode

• A fixed upper limit of 1500 bytes (14-byte Ethernet header NOT included)

**User manual** :<http://dserver.macgui.com/Uthernet%20II%20manual%20draft.pdf>

---

Source: https://maker.wiznet.io/WIZnet/resellers/uthernet-ii-ethernet-card-for-the-apple-ii-series/