X-Hacker.org- Interrupts & Ports - set up sound multiplexor (pcjr only)

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        Set up sound multiplexor (PCjr ONLY)

        entry:
          AH = 80h
          AL = 0 source is 8253 channel 2
               1 source is cassette input
               2 source is I/O channle "Audio IN"
               3 source is sound generator chip

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