INT 2F U - SoundBlaster speech driver - INSTALLATION CHECK
        AX = FBFBh
        ES = 0000h
Return: ES nonzero if installed
            ES:BX -> entry point data structure (see below)
SeeAlso: INT 80/BX=0000h,INT F3"SoundBlaster"

Format of entry point data structure:
Offset  Size    Description
 00h  3 BYTEs   signature "FB "
 03h    BYTE    driver major version number???
 04h    DWORD   speech driver entry point
 08h 24 BYTEs   ???
 20h  ? BYTEs   data buffer for calling speech driver

Call driver entry point with:
        AL = function
            07h speak a string
                data buffer (see above) contains:
                        BYTE  length of string
                      N BYTEs string to speak