You have to drop the macmess folder into your documents. In your roms folder, you need to create a folder called a7800. Drop the attached bios in that folder. You should be good to go!
Update:
Name the attached file 7800.rom. It wouldn't let me upload it with that extension.
Update: You'll need to download the 7800 rom from here:
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Mac 7800 emulator
in Atari 7800
Posted · Edited by Allpaul
You have to drop the macmess folder into your documents. In your roms folder, you need to create a folder called a7800. Drop the attached bios in that folder. You should be good to go!
Update:
Name the attached file 7800.rom. It wouldn't let me upload it with that extension.
Update: You'll need to download the 7800 rom from here:
http://www.atari7800.com/download/index.htm#8