I was trying to replicate this on DOS box without success. I can disable extended and expanded memory, but seems that DOSBOX has always a min of 1MB of memory free, and that is enough for the game to go full graphics.
Something interesting: if you change the graphics from VGA to EGA, the installer actually converts the art to 16 colors without backup, so, if you later want to go back to VGA, it asks for the original discs.
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