I didn’t play it in ages, but I remember the game changing the graphics based on the expanded memory size and CPU (and perhaps a command line option). The most obvious change was the explosions. Instead of a big blast you get some minor “pufs”, even on the game intro.
I remember deliberately doing that to speed up some battles, but I’m now curious if there are other changes on the gameplay.
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.