---
title: "Z80 interface to the WIZ830MJ module"
url: "https://maker.wiznet.io/forum/10348"
markdown_url: "https://maker.wiznet.io/forum/10348/md"
type: "Forum topic"
category: "IO Modules"
author: "norby"
created: "2014-07-04T02:44:47+09:00"
last_activity: "2017-05-04T08:33:19+09:00"
language: "en"
views: 917
replies: 0
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Z80 interface to the WIZ830MJ module

## Question

Asked by norby on 2014-07-04 in IO Modules.

I bought several WIZ830MJ modules, but cannot get them working with the Z80 in 8 bit mode. I’m using I/O instructions to read and write to the port that has the WIZ830MJ attached. I always get 0x00 back and cannot change any bit. I’m new to the WIZ830MJ module and any feedback is appreciated to get this working.

---

Source: https://maker.wiznet.io/forum/10348