I´vetried out another DOS emu called Bochs, and it gives me the following log message whem my game crashes (please pay attention to the last instruction set marked as Bold):

00276967812i[VGA ] VBE known Display Interface b0c2
00276993638i[WGUI ] dimension update x=720 y=400 fontheight=16 fontwidth=9 bpp=8
00277011632i[WGUI ] dimension update x=640 y=400 fontheight=16 fontwidth=8 bpp=8
00277028371i[VGA ] VBE known Display Interface b0c2
00277029626i[WGUI ] dimension update x=720 y=400 fontheight=16 fontwidth=9 bpp=8
00277056617i[WGUI ] dimension update x=640 y=400 fontheight=0 fontwidth=0 bpp=8

[b]00277143100i[CPU ] LOCK prefix unallowed (op1=0x2b, attr=0x100, mod=0x0, nnn=0)[/b]

What does this LOCK prefix means? It´s some kind of special function used by old CPU´s? Just curious. :confused:

Thanks for reading.
Regards,
RC.