Int 15 Fn 4900  - Far East Ms-dos - Get Bios Type                          [J]

   AX = 4900h

Return: CF clear if successful
       AH = 00h
       BL = BIOS mode
       00h DOS/V
       01h standard DBCS DOS (hardware DBCS support)
   CF set on error
       AH = 86h (function not supported)

Note:  in practice, DOS/J returns AH=86h; AX DOS does not support this call

See Also: AH=50h,INT 21/AH=30h