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
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Paul Ford // (646) 369-7128 // @ftrain