[Àû¿ë´ë»ó: DOSBox-x]

Set DOS version.
Specify as major.minor format.
A single number is treated as the major version (LFN patch compat).

Common settings are:
auto (or unset) : Pick a DOS kernel version automatically

3.3 : MS-DOS 3.3 emulation (not tested!)

5.0 : MS-DOS 5.0 emulation (recommended for DOS gaming)

6.22 : MS-DOS 6.22 emulation
7.0 : Windows 95 (pure DOS mode) emulation
