Geee, you're losing me.
It's simple: Turn on expansion pack; 8 mb. Turn off: 4 mb.
And if you insert the expansion pack, it gets 8 mb. There is no such thing as an "8 mb" expansion pack. It gets a toal of 8 with the regular 4 mb expansion pack.
The problem is the game fushigi no Dungeon 2, someone said it need 8mb expansion pak to run the game, but it freeze after the game is over. Whatever, I adust for the game, it freeze on the same screen.