5 ms·There used to be stock exchanges running happily on DOS. Maybe there still are.by queuebert 5mo agoThere used to be stock exchanges running happily on DOS. Maybe there still are.chaps 5mo agoWorked at an exchange in 2007/2008 and... we had systems still running from the 80s. Mostly tape audit stuff.BirAdam 5mo agoMost use Linux now, and specifically RHEL. I did see some IBM z, but that was specifically for one old DB that handled oil pipeline stuff.