Princess Maker 2 (DOS) Roland Driver for IRQs othen than IRQ 2
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Make a backup of the original MMD.COM file in the game's directory.
Rename MMD_IRQ#.COM (where # is corresponding IRQ number you suppose to use) to MMD.COM 
and overwrite it in the game directory.

patch made by: kykypyza
https://kykypyza.tistory.com/7
https://www.vogons.org/viewtopic.php?p=952317#p952317