How do I get the Atari800 emulator set up?

I’m trying to emulate an Atari 8-bit computer system and I keep getting an error that says I need a real Atari/OS.

I looked it up and found that the Atari800 emulator not only needs the 5200.ROM file as the BIOS for the Atari 5200, but also various other BIOS files for several Atari 8-bit computers.

With this in mind, I put the BIOS files into a preset directory and tried again. Still no luck. What am I doing wrong?

You need to copy the BIOS files to the retroarch system folder:

5200.rom ATARIBAS.ROM ATARIOSA.ROM ATARIOSB.ROM ATARIXL.ROM

And then (i think) open the RetroArch Atari 800 emulador and config the path to the system folder. Do not forget Save configuration

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On Android. See where I posted this.