Love the advent calendar! Wonderful idea. One tiny note: On a Mac with qemu installed via the brew installer I don't have access to kvm, so to run the Slackware image I had to remove the kvm command-line option from the "Run" shell script.
It was all a little new to me (not a regular qemu user) so it might be worth flagging or making two Run scripts, one for mac and one for everyone else, or adding a README? FreeDOS ran beautifully and it was great to see it again. Best wishes, Paul -- Paul Ford // (646) 369-7128 // @ftrain