The Atari FujiNet Weather Program running on a vintage computer monitor.
Benj Edwards / How-To Geek

That old Atari eight-bit computer (like the Atari 800, XL, or XE series) you have is useful for more than just retro gaming. If you pair it with the new FujiNet network adapter and a weather program, you can get live local weather info on it. Here’s how it works!

Breathing New Life Into Old Atari Computers

For Atari hobbyists, the company’s eight-bit computer platform is far from dead. First introduced in 1979, the Atari Home Computer series once competed with the Apple II and the Commodore 64. Its technical flexibility has also inspired a die-hard fan base that persists to this day.

An Atari 800 computer.
The Atari 800 computer system, first released in 1979. Atari

Hobbyists regularly release new software for this vintage platform, however, it’s rare to find a non-gaming application that’s actually useful. Perhaps that’s why this new Atari-powered internet weather program impressed so many when I posted images of it in action on Twitter.

Everyone wants to feel useful, and people love to make old technology useful, too. In this case, it’s possible thanks to the Atari OpenWeather client (or “Weather.xex,” in reference to the Atari binary file).

The program is the brainchild of Polish programmer, Wojciech Bociański (also known as “bocianu”). He’s been using Atari computers since 1985 and often programs his own games for them in his spare time.

Bociański said he originally created the program to test the Atari’s network capabilities. Because it’s become (unexpectedly) popular, he plans to continue updating it with new features for Atari fans.

A weather forecast on an Atari 800XL computer monitor.
An Atari 800XL computer running a weather app through FujiNet. Benj Edwards / How-To Geek

Bociański’s program pulls live weather data about your location from OpenWeather, a service that provides the data through an API. That bit of magic alone requires lots of behind-the-scenes network data translation, which is impressive enough.

However, the most striking thing about Weather.xex is its beautiful display. It’s handsome enough to leave running all day on your vintage monitor or TV to get that retro-weather-station feel.

The Magic of FujiNet

Weather.xex doesn’t do its job alone. As mentioned above, it also requires a network adapter called FujiNet. In 2019, Atari homebrew veterans, Joe Honold (aka “mozzwald”) and Thomas Cherryhomes, started looking for a compact way to simulate a dial-up modem on an Atari computer for tasks like calling a BBS.

They decided to create their own Wi-Fi-powered device. Other contributors came aboard and the crew added disk drive emulation, printing functionality, and the ability to simulate other Atari peripherals.

Thus, FujiNet was born!

RELATED: Remember BBSes? Here's How You Can Visit One Today

A FujiNet adapter plugged into an Atari 800XL.
A FujiNet adapter in a 3D-printed case plugged into an Atari 800XL computer. Benj Edwards / How-To Geek

This network adapter connects to the serial peripheral (SIO) port on an Atari eight-bit computer, and it’s quickly becoming the Swiss Army knife of the platform. FujiNet works with every model of the Atari eight-bit computer series that has at least 18K of RAM, including the 800, 1200XL, 800XL, XE Game System, 65XE, and 130XE. The 400 and 600XL won’t work without RAM upgrades.

The magic of FujiNet is in its internal ESP32 microcontroller, which is a powerful embedded computer module with built-in Wi-Fi and Bluetooth capabilities.

With FujiNet, you can pull games directly off servers on the internet and run them on your Atari. You can also load disk images from a microSD card, simulate a printer or a cassette drive, and much more.

Developers continue to discover surprising new applications for the technology and revisions of the hardware are likely in the future.

How to Set Up an Atari Weather Terminal

To set up a FujiNet-powered Atari weather terminal, you, of course, need an Atari eight-bit computer. Weather.xex will run on any model with 48 K RAM and up (which excludes the Atari 400 and 600XL unless they’ve been upgraded).

If you’re starting from scratch, the Atari 800XL is a good model to get. It’s reliable, has 64 K of RAM, and is relatively easy to find on eBay. Another good option is the Atari 130XE, which includes 128 K of RAM and can run more sophisticated homebrew software.

A FujiNet adapter installed on an Atari 800XL.
An Atari 800XL computer with a FujiNet adapter installed. Benj Edwards / How-To Geek

Next, you’ll need a FujiNet adapter. It’s open-source hardware, so you can build one yourself. If you prefer, you can buy one from several vendors, including The Brewing AcademyThe Vintage Computer Center, or Sell My Retro.

When you have your FujiNet adapter, plug it in to the Atari’s SIO port, and then turn on your Atari.

After the main FujiNet program loads automatically, you’ll be asked for your Wi-Fi information. After the FujiNet is connected to your network, you’ll see a list of Tiny Network File System (TNFS) servers at the top; select “”

Select "" from the "TNFS Host List."
Benj Edwards / How-To Geek

After you’re connected to, navigate to the “Networking” directory and choose “weather.xex.” Assign it to the Drive 1 slot of your FujiNet as read-only, press Option to reboot your Atari, and then weather.xex will load.

Alternatively, you can download the weather.xex binary. Copy it to a microSD card, insert it into your FujiNet adapter, and then load it from there.

Using the Atari Weather Program

When Weather.xex loads, the program will attempt to automatically determine your location based on your IP address. You can override this manually at startup by pressing Select and typing your location.

You’ll then see an overview of the current local weather. It updates every hour and at midnight, to fetch the new time and date. According to Bociański, you’ll be able to adjust the update frequency in future versions of the program. Right now, though, it would put too much strain on the free API data key the program uses.

The Weather.xex status screen on an Atari 800XL.
Benj Edwards / How-To Geek

You can also perform the following actions via the keyboard:

  • Press R: To reload the weather data.
  • Press U: To change from the standard to metric system.
  • Press F: This loads a split-screen eight-day forecast.
A four-day weather forecast on an Atari 800.
Benj Edwards / How-To Geek

Overall, Weather.xex is an amazing program. However, it only scratches the surface of what’s possible with FujiNet. According to Cherryholmes, there are plans to bring the FujiNet concept to other retro computers, like the Apple II and Commodore 64.

Given enough time and effort, it’s likely vintage computer hobbyists will continue to discover new and amazing ways to make use of old machines.

Profile Photo for Benj Edwards Benj Edwards
Benj Edwards is a former Associate Editor for How-To Geek. Now, he is an AI and Machine Learning Reporter for Ars Technica. For over 15 years, he has written about technology and tech history for sites such as The Atlantic, Fast Company, PCMag, PCWorld, Macworld, Ars Technica, and Wired. In 2005, he created Vintage Computing and Gaming, a blog devoted to tech history. He also created The Culture of Tech podcast and regularly contributes to the Retronauts retrogaming podcast.
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