Int 2F Fn E002  - Setdrver.com V2.10+ - Get Original Dos Version Info      [U]

   AX = E002h

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)

See Also: AX=E003h,AX=E007h,INT 21/AH=30h