INT 62 u - FGDRIVER v1.10 - "FG_SOUND" - MAKE SOUND FOR SPECIFIED DURATION
        AX = 0088h
        BX = frequency in Hertz (18-32767)
        CX = duration in clock ticks (0000h or negative for continuous sound)
Note:   ignored if asynchronous sound (AX=0089h,AX=008Bh,AX=008Dh) is in
          progress
SeeAlso: AX=008Ah,AX=008Eh,AX=0090h