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Did you know there're over 1000 different PC mainboard in the world?
Since the IBM PC-XT (8086), and the first "clone" from Compaq, a lot of different PC variant on the market. So the software have to take care of all these, even if some of them fade out already.
This is a tough job for FreeDOS (or other DOS such as DR-DOS). They have to take care the old and the new hardware at the same time, just like build a house for the dinosaur and human to live, conflicts inevitable.
I'm lucky that got new and old hardware to test, and I want to share my experience with others.