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        Return information about the driver

        Entry:
          AH = 1Bh
          DX = port number
          CX = size of user buffer
          ES:DI -> user buffer for driver info (see below)

        Return:
          AX = number of characters transferred

        Format of driver info:

        Offset  Size    Description
         00h    WORD    size of structure in bytes
         02h    BYTE     FOSSIL spec driver conforms to
         03h    BYTE    revision level of this specific driver
         04h    DWORD   pointer to ASCIZ identification string
         08h    WORD    size of the input buffer
         0Ah    WORD    number of bytes left in buffer
         0Ch    WORD    size of the output buffer
         0Eh    WORD    number of bytes left in buffer
         10h    BYTE    width of screen
         11h    BYTE    length of screen
         12h    BYTE    actual baud rate, computer to modem