What do the lights/buttons do?

See the quick-start guide here

Why does FujiNet on the 400/800 require USB power?

It’s not a power issue. The 400/800 computers actually boot faster than the XL or later version of the computer. The newer Atari’s scan to see if the user is holding the option key to disable BASIC on startup. The scanning and debounce logic slows the boot up time just enough to allow the FujiNet device to start and begin scanning for SIO devices.

Why can’t I get SAM to speak on my 400/800.

This feature requires an XL/XE system or a ROM upgrade
The standard 400/800 ROMs do not recognize any P: device except P1:

Do I need a special FujiNet driver to simulate an 850?

The standard bootstrap loader is all you need.

Do I need a special FujiNet driver to access the N: device?

Yes, you need the load the n-driver which can be found on the atari-apps.irata.online TNFS server under networking/n-handler.

How do I get the IP address of my FujiNet device?

From the main config screen on the Atari, press ‘C’

How do I get my “printout” from FujiNet?

From your browser, go to http://<IP of FujiNet device>
Click on the printer icon to download your file.