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Use "MMTimer on" in options to make the emu normal speed.
Seems this official emu is the only way to get MONS2.ISX (09/03/2000) to load, none of the ISX converters seem to be able to make a working ROM...
Also it seems GS_Korean also has a mons2_org folder with some code last modified Nov 1999, maybe this is the JP code untouched too but not sure yet.