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FujiNet Go

FujiNet Go Desktop

Atari 5200 SuperSystem

The Atari 5200, with FujiNet on the cartridge slot.

FujiNet Go Atari 5200 v0.1.1 Released November 3, 2026 Atari, 1982

Download and install Source code

Screenshots

GNOME

The FujiNet CONFIG client running on the console
The debugger's Memory Map: the 5200's address map and the FujiNet cartridge's mailbox
The Controllers window - four controllers with analog stick and fire buttons, the keypad, and START, PAUSE and RESET

KDE

The FujiNet CONFIG client running on the console
The debugger's Memory Map: the 5200's address map and the FujiNet cartridge's mailbox
The Controllers window - four controllers with analog stick and fire buttons, the keypad, and START, PAUSE and RESET

Windows

The FujiNet CONFIG client running on the console
The debugger's Memory Map: the 5200's address map and the FujiNet cartridge's mailbox
The Controllers window - four controllers with analog stick and fire buttons, the keypad, and START, PAUSE and RESET

Features

  • Atari 5200 in NTSC, with the FujiNet cartridge built in; it boots straight into CONFIG
  • .a52, .bin, .rom and .car cartridges, loose or in a zip, including Super Cart and Bounty Bob banking
  • Controllers window with all four controllers - analog stick, two fire buttons and the 12-key keypad - plus START, PAUSE and RESET, remappable to keyboard and gamepad
  • Mouse and gamepad drive the stick as a true analog control
  • Debugger with monitor console, CPU & memory, disassembly with BIOS labels, ANTIC, GTIA, POKEY, memory map and cartridge state, breakpoints and FujiNet tabs
  • FujiNet web UI in your browser, or switch to an external FujiNet

BIOS ROMs

Optional

Nothing is needed. The free Altirra 5200 OS is built in; Atari's own BIOS can be imported and selected in Preferences.

  • Built in: Altirra 5200 OS, © Avery Lee, freely redistributable
FileWhat it isCRC32Needed
co19156.u8 4-port BIOS (2 KB) 4248D3E3 Optional
co19156a.a8 2-port BIOS (2 KB) C2BA2613 Optional

How to add them: Console ▸ Import BIOS… takes a file, a ZIP (MAME's a5200.zip works) or a whole folder, and matches images by size and CRC.

Download and install

FujiNet Go Atari 5200 0.1.1, released November 3, 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.atari5200.gnome

Windows

Installer Recommended

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

Download fujinet-go-atari5200-0.1.1-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 5200 from the Start menu.

Portable zip

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

Download fujinet-go-atari5200-0.1.1-windows.zip

8.3 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-atari5200-0.1.1-macos-arm64.zip · 6.0 MB Intel fujinet-go-atari5200-0.1.1-macos-x86_64.zip · 5.9 MB
  1. Open the downloaded zip and drag FujiNet Go Atari 5200 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 5200.app"
Every file in this release, with SHA-256 checksums
FileForSizeSHA-256
online.fujinet.go.atari5200.gnome.flatpak Linux · GNOME · Flatpak bundle 5.2 MB be6e0d052c3a9177c23de1af984f3fa5d550e26088273bc44b4f8040d6c53375
online.fujinet.go.atari5200.kde.flatpak Linux · KDE · Flatpak bundle 5.1 MB 0b49d011b501f7e67ca40a08d9ccb4e9dae0d261590ad1c0efea16d4bf5b4992
fujinet-go-atari5200-gnome-0.1.1-Linux.deb Linux · GNOME · .deb 5.4 MB 40c9d17ccd7c4c1349160a5609f2600483c4a0004f334658d8247eda8a9e34de
fujinet-go-atari5200-kde-0.1.1-Linux.deb Linux · KDE · .deb 5.5 MB 8e57b0c56a1fe2de0f117eebcb1bbbd97465d18b4094c8f20cc55ef0be0a6f4c
fujinet-go-atari5200-gnome-0.1.1-Linux.rpm Linux · GNOME · .rpm 4.6 MB bb10055b97c03f8374fdcf762412c4e83bdb37366e82a95d5da811f2841c4259
fujinet-go-atari5200-kde-0.1.1-Linux.rpm Linux · KDE · .rpm 4.7 MB 46c84a8fc808d8e43503c3c66ef1d84c99d2d4930a57c247ae838278b5749f98
fujinet-go-atari5200-gnome-0.1.1-Linux.tar.gz Linux · GNOME · .tar.gz 5.4 MB 14333882dad70cbecbfe76485478e9f32b8f4ca827c9d0af04e13d508dafcd86
fujinet-go-atari5200-kde-0.1.1-Linux.tar.gz Linux · KDE · .tar.gz 5.5 MB de33c7bb82483399108e82a938465153243d2fe78da9f3ea77c21f7ebfca5663
fujinet-go-atari5200-0.1.1-windows-setup.exe Windows installer 6.5 MB aea2e0740a139060309777ebe2e7d069a2c52db3d0397be64381c2c8cba61884
fujinet-go-atari5200-0.1.1-windows.zip Windows portable zip 8.3 MB 480f9814eda02c2cecc37fcb56c31dc721b2de4b4ab38677423942c7927a5748
fujinet-go-atari5200-0.1.1-macos-arm64.zip macOS · Apple silicon 6.0 MB 0ea7a2806b2b751e5f667358ce238cfcf02a65c58a044ac5be286f2b4d7fa7f4
fujinet-go-atari5200-0.1.1-macos-x86_64.zip macOS · Intel 5.9 MB 9a156f2b09447de0d80e244494363cad2c321e2ef9c04faf69760dec71c36be2

Built on

FujiNet Go Atari 5200 is free software (GPL-3.0). It stands on these projects:

  • Atari800 GPL-2.0-or-later

    Emulator core, forced into 5200 mode. The Atari800 development team

  • Altirra 5200 OS Permissive (see the Altirra ROM notice)

    Free replacement BIOS. 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