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FujiNet Go

FujiNet Go Desktop

Atari 8-bit computers

The Atari 400, 800, XL and XE, with FujiNet on SIO.

FujiNet Go Atari 800 v0.4.0 Released November 2, 2026 Atari, 1979

Download and install Source code Also on Android

Screenshots

GNOME

FujiNet's CONFIG on an Atari 130XE, browsing hosts and drive slots
The debugger: disassembly of the running code
Preferences: model, memory, BASIC and system ROMs

KDE

FujiNet's CONFIG on an Atari 130XE, browsing hosts and drive slots
The debugger: disassembly with the OS's labels
Preferences: model, TV system, system ROMs and memory expansions

Windows

FujiNet CONFIG on an Atari 130XE, on Windows
The debugger: disassembly with the OS's labels
Settings: model, TV system, ROMs and memory expansions

Features

  • Machines: 400/800, XL, XE, XEGS, 1400XL and 1450XLD, with 80-column cards and other peripherals
  • FujiNet on SIO through NetSIO; boots straight into CONFIG
  • Media: .atr, .xfd and .atx disks, .car, .rom and .bin cartridges, .cas tapes, and programs
  • Controllers panel with keyboard, console keys and joysticks; the mouse drives paddles, Koala Pad and light pen
  • Debugger: monitor console, ANTIC and display list, GTIA, POKEY, PIA, SIO and a NetSIO tab
  • Use the built-in FujiNet or an external one

BIOS ROMs

Nothing to download

AltirraOS and Altirra BASIC, free replacements for Atari's ROMs, are built in. Nothing to download.

  • Built in: AltirraOS and Altirra BASIC, © Avery Lee, freely redistributable

How to add them: Machine ▸ Import System ROMs… accepts Atari's own OS and BASIC images or MAME zips, recognised by size and CRC.

Download and install

FujiNet Go Atari 800 0.4.0, released November 2, 2026. Release notes

Linux

Desktop
Package

Install with Flatpak (any distribution)

  1. Install Flatpak with your distribution's package manager if you don't have it yet.
  2. Add Flathub, which supplies the runtime, and the FujiNet Go repository: 
    flatpak remote-add --user --if-not-exists flathub \
    https://dl.flathub.org/repo/flathub.flatpakrepo
flatpak remote-add --user --if-not-exists fujinet-go \
    https://fujinetwifi.github.io/fujinet-go-desktop-flatpaks/fujinet-go.flatpakrepo
  3. Install the GNOME edition (or swap gnome for kde): 
    flatpak install --user fujinet-go online.fujinet.go.atari800.gnome

Windows

Installer Recommended

Windows 10 or 11, 64-bit. Installs for your user only and needs no administrator rights.

Download fujinet-go-atari800-0.4.0-windows-setup.exe

6.5 MB

  1. Run the downloaded file.
  2. If Windows SmartScreen says it protected your PC, choose More info, then Run anyway. The app isn't code-signed yet.
  3. Start FujiNet Go Atari 800 from the Start menu.

Portable zip

Nothing to install. Good for a USB stick or a locked-down PC.

Download fujinet-go-atari800-0.4.0-windows.zip

8.2 MB

  1. Right-click the zip, choose Extract All…, and pick a folder.
  2. Open the folder and run the .exe inside.

macOS

macOS app

macOS 13.3 or later. Pick the build for your Mac's chip.

Apple silicon fujinet-go-atari800-0.4.0-macos-arm64.zip · 6.0 MB Intel fujinet-go-atari800-0.4.0-macos-x86_64.zip · 5.9 MB
  1. Open the downloaded zip and drag FujiNet Go Atari 800 into Applications.
  2. The first time, Control-click the app and choose Open, then Open again. (On macOS 15 and later: try to open it, then go to System Settings ▸ Privacy & Security and choose Open Anyway.)
  3. Or clear the download quarantine in Terminal: 
    xattr -dr com.apple.quarantine "/Applications/FujiNet Go Atari 800.app"
Every file in this release, with SHA-256 checksums
FileForSizeSHA-256
online.fujinet.go.atari800.gnome.flatpak Linux · GNOME · Flatpak bundle 5.2 MB b075e1896f6a67e2c182fa38ed8081beb2357eac638d6b97868c0473e11a0852
online.fujinet.go.atari800.kde.flatpak Linux · KDE · Flatpak bundle 5.1 MB a8bdebafb4d69dd5f7e369e5b0656461f844a47d67fd23a8294f7e957ebe85c0
fujinet-go-atari800-gnome-0.4.0-Linux.deb Linux · GNOME · .deb 5.4 MB 916e899cfc96708febee2a6bd75886e708768a047e1906fbf5f3aaa7814385b5
fujinet-go-atari800-kde-0.4.0-Linux.deb Linux · KDE · .deb 5.4 MB 9016781a84633cacf4abafd5862a4380f252a42f2b370816473250300eadd78d
fujinet-go-atari800-gnome-0.4.0-Linux.rpm Linux · GNOME · .rpm 4.6 MB b1f01a8abe58294cc236562a88c8824df471d764a6b5516d39438aed2b056564
fujinet-go-atari800-kde-0.4.0-Linux.rpm Linux · KDE · .rpm 4.7 MB 15184ad0fced377290937a36cadd9346f3dbc13f128ebc1b68c36c60b11eab06
fujinet-go-atari800-gnome-0.4.0-Linux.tar.gz Linux · GNOME · .tar.gz 5.4 MB f72a0ac614462cec01e3048a5d4fb22382e57477c557e02f6bdeae835927a2c5
fujinet-go-atari800-kde-0.4.0-Linux.tar.gz Linux · KDE · .tar.gz 5.4 MB 13239b9c60ba86634cd23d2340f0eb6df17de646024725bb723b24350c7c13d8
fujinet-go-atari800-0.4.0-windows-setup.exe Windows installer 6.5 MB 0cf102a929682dfa96ba78b4f4ae995105d434c564480273e48fadadb8bcf951
fujinet-go-atari800-0.4.0-windows.zip Windows portable zip 8.2 MB b1dd4d121d136899c2b0eca4b6b15c7e28fd68ee48410ace093c3f6969726903
fujinet-go-atari800-0.4.0-macos-arm64.zip macOS · Apple silicon 6.0 MB db74d871f11f9b424898b7567bb3ed94f9e04ba133e4a112a8a06354bbf58934
fujinet-go-atari800-0.4.0-macos-x86_64.zip macOS · Intel 5.9 MB 63c702f6c64267cf90ddbbc4d16d359eb9db34536eb8fbb38c08973b5423afd5

Built on

FujiNet Go Atari 800 is free software (GPL-3.0). It stands on these projects:

  • Atari800 GPL-2.0-or-later

    Emulator core. The Atari800 development team

  • AltirraOS and Altirra BASIC Permissive (see the Altirra ROM notice)

    Free OS and BASIC ROMs. Avery Lee

  • OpenSSL 3 Apache-2.0

    Cryptography. The OpenSSL project

  • fujinet-firmware GPL-3.0-or-later

    The FujiNet itself, built into every app. Thomas Cherryhomes and the FujiNet contributors

  • Mbed TLS Apache-2.0

    TLS for FujiNet's network protocols. The Mbed TLS contributors

  • libssh, libsmb2, libnfs LGPL-2.1-or-later

    FujiNet's SSH, SMB and NFS protocols. Their respective authors

  • cJSON, expat MIT

    JSON and XML parsing in FujiNet. Dave Gamble; the Expat maintainers

  • SDL 3 Zlib

    Video, audio and gamepads. Sam Lantinga and the SDL contributors

  • GTK 4 and libadwaita LGPL-2.1-or-later

    The GNOME edition's interface. The GNOME project

  • Qt 6 LGPL-3.0-only

    The KDE edition's interface. The Qt Company and contributors

The full list of bundled code, versions and licences is in COMPLIANCE.md. Source code · All releases · Report a problem