Int 2D  - Freever - Get Original Dos Version Info                          [U]

   AL = 12h
   AH = AMIS multiplex number for FREEVER

Return: AL = FFh if successful
       BH = major DOS version
       BL = minor DOS version
       CH = DOS version flag
       CL = OEM number
       DH = major DR DOS version number (FFh if unknown)
       DL = minor DR DOS version number (FFh if unknown)
Program: FREEVER is an AMIS-conformant freeware DOS version-faking TSR similar
     to SETVER for any DOS-compatible OS, written by Matthias Paul

See Also: INT 2D/AL=13h"FREEVER",INT 2D/AL=14h"FREEVER",INT 2D/AL=17h"FREEVER"