That said, I am at least partially wrong.
Changing colors works in VirtualBox, QEMU and DOSEMU2.
color 0 is black, this is the default color for text mode.
In Debug:
-o 3c8,0
-o 3c9,0
-o 3c9,0
-o 3c9,ff
Change the black to blue.
(out 3c8,0 choose color 0, then first value at 3c9 is red=0, next green=0 then
blue to the max).
It is a bit more complicated than I thought/said.
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