Int 10 Fn 6A00  - Direct Graphics Interface Standard (dgis) - Inquire Ava  [V]

   AX = 6A00h
   BX = 0000h
   CX = 0000h
   DX = buffer length (may be 0)
   ES:DI -> buffer

Return: BX = number of bytes stored in buffer
   CX = bytes required for all descriptions (0 if no DGIS)

Note:  buffer contains descriptions and addresses of DGIS-compatible
     display(s) and printer(s)

See Also: AX=6A02h