I have seen some videos here and there about programming in DOS. Must be pretty interesting since it's such a bare-bones OS compared to what came later. I actually set up DOSBox-X a while ago and played some PC-98 stuff on it. Incredible stuff, truly amazing how good it is. It is now my PC-98 emulator, and has also replaced original DOSBox. Apparently you can also run Windows on it, but I haven't tried that yet. The guy wants it to be kind of a universal emulator for old computers, right? Really ambitious but it already somehow looks very close to being that.