INT 80 - SBSIM - "GETVOLUME" - GET SOURCE'S VOLUME BX = 0400h AX = sound source (see #03974) Return: CF clear if successful AX = volume CF set on error AX = error code (see #03972 at INT 80/BL=00h) SeeAlso: BX=0401h"SBSIM" (Table 03974) Values for SBSIM sound source: 00h master volume 01h voice 02h FM(Frequency Modulation) A method of encoding data as a series of magnetic flux reversals on disk or tape, commonly known as single-density recording. In frequency modulation, a series of clock pulses are written at regular intervals, with one data bit for each clock pulse. See also MFM, RLL. 03h CD 04h line in 05h microphone