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When I try to run a rom it opens a green menu but I don't know ai can play that rom... I've tried ti charge it on floppy a or floppy b but it doesn't work. The file is unzipped and it is an. . st file mi
The solution:
https://forum.recalbox.com/topic/2541/solved-atari-st-how-to-modify-the-st-file-for-direct-start-in-emulator