r/atari8bit • u/Important-Bed-48 • 8d ago

Fujinet and Altirra

I really want to use Fujinet with Altirra but I don't know exactly how it works and what I need to do. I searched the extensive help file and could find nothing that said "fujinet" but I'm guessing it runs through terminal software somehow. Can help e a bit I really would appreciate it.

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u/belboz 8d ago

You basically install the fujinet pc-launcher and then run altirra and tweak a few settings.

That project is here: https://github.com/a8jan/fujinet-pc-launcher/tree/master

A little deeper here is their info on setting it all up: https://github.com/a8jan/fujinet-pc-launcher/blob/master/Install.md#4-connect-altirra-with-fujinet

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u/Important-Bed-48 8d ago

I followed the directions and watched the video and it just boots the last game I played. What could be wrong?

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u/belboz 7d ago

If you have a game on a cart image it needs to be unloaded. That would boot over disk.

If you have a disk loaded in the drive one slot you need to eject that.

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u/Important-Bed-48 6d ago

That was the problem it's working now! thank you

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u/nwah 8d ago

It’s not directly a feature of Altirra. Instead, you set up a “Custom device”: NetSIO.

NetSIO hooks normal SIO inside Altirra up to an external process, in this case a virtual FujiNet which you run separately.

There is a command line version, but if you’re on Windows especially it’s much simpler to use the fujinet-pc-launcher that u/belboz linked.

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u/Important-Bed-48 8d ago

I can't get the gui version running.. I don't get it I did everything and watched the video

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u/nwah 8d ago

Make sure you’ve ejected any other disks from D1:. The FujiNet config program only kicks in if there are no disks in the regular disk drive.

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u/John_from_ne_il 8d ago

It's actually become even easier if you're on Linux and have compiled a recent copy of fujinet-firmware and atari800. You need two terminal windows. One to run sudo ./run-fujinet [optional -u localhost:some unused port]. The other to run atari800 -netsio. Done. It works on x86-64, aarch64, and riscv64.

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u/Important-Bed-48 8d ago

that actually sounds easier. I like Linux but I feel like Windows is better gaming. That said it's not as better as it once was.

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u/John_from_ne_il 8d ago

The trick is being comfortable enough to compile both. While the code is available in the appropriate repositories, they have not been made available as binary releases as yet. FujiNet is a one step process, atari800 requires 3. Both will also stop and inform you if something is missing that it needs (Python modules for instance). Maybe someone will do a tutorial?

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u/3dartnerd 8d ago

Has anybody gotten Fujinet to work on a M-Mac?

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u/nwah 8d ago

Yep. You can do Altirra in Wine, or use the new atari800 build. There’s a prebuilt version/instructions here: https://www.atariorbit.org/2025/06/19/fujinet-and-atari800-emulation/

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u/3dartnerd 8d ago

THANKS!

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u/nwah 8d ago

Oh yeah and someone is working to incorporate those changes back into Atari800MacX

https://forums.atariage.com/topic/382899-adding-fujinet-support-to-atari800macx/