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  Interrupt:   1Ah     Function:   80h
 
  Title:       Set Sound Source
 
  Description:                                                      [PC]
 
     Sets up the source for tones that will appear on the PCjr's "Audio
     Out" or RF modulator. This function is supported on the PCjr only.
 
     Input                                     Output
 
     AH = 80h                                  None
     AL = Sound source
        = 00h (if 8253 programmable timer,
              channel 2)
        = 01h (if cassette input)
        = 02h (if "Audio In" line on I/O
              channel)
        = 03h (if sound generator chip)
                                    -♦-