.st .msa .stx .dim .ipf .m3u .zip .7z
It’s strongly recommended that you use
.stx files, or zipped versions of those files.
.msa should also run well. Although nointro has indexed games in
.ipf format, using this format is not recommended. While they will work, the system will launch into the OS window instead of directly into the game, and you’ll have to double click to launch the game.
The Atari ST requires a boot image file called
tos.img to be stored in your bios folder. There are actually many files that can fulfil this requirement, and not all of them will work with all games. The best version for basic ST gaming is 1.04, followed by 1.02. If you’re using known STE games, you want version 1.62.
Here is a list of known good TOS Images and their hashes:
Make sure to rename the file to
tos.img when you put it in your BIOS folder.