[Àû¿ë´ë»ó: 0.74_SVN, 0.74_SVN_new, DOSBox-x]

Emulate BIOS INT 15h PS/2 mouse services
Note that some OS's like Microsoft Windows neither use INT 33h nor probe the AUX port directly and depend on this BIOS interface exclusively
for PS/2 mouse support.

In other cases there is no harm in leaving this enabled