INT 6F - HP Vectra EX-BIOS - "F_SND_TONE" - SOUND TONE WITH FREQ AND DURATION
	AH = 3Eh
	BP = 0012h (driver ID of V_SYSTEM)
	BX = frequency in Hz (1-25000, 0 = off)
	DX = duration in 10-microsecond increments
Return: AH = status (see #03744)
	BP,DS destroyed
SeeAlso: AH=00h"HP Vectra",AH=3Ah/BP=0012h,AH=3Ch/BP=0012h,AH=40h/BP=0012h