@lyda Permacomputing community is interested in old operating systems and many demosceners (including me) write audiovisual projects (demos) for DOS by using assembly and C.Basically, I write my own code for DOSBox which I believe corresponds to the last official MS-DOS (6.22) but actually I haven't checked this – I'm not a real DOS expert.In case I need DOS advice, I might check some programming related IRC channels (eg. at libera server) or demoscene's pouët webforum.