Assuming that some remain, I believe ArcaOS was licensed from IBM to provide support in such circumstances. Not to mention that you aren't going to use software

Assuming that some remain, I believe ArcaOS was licensed from IBM to provide support in such circumstances. Not to mention that you aren't going to use software from Hobbes on an ATM. For what it's worth, I have seen OS/2 used in banks within the past decade (though I believe those banks have since migrated to Windows).