X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 1a - pcjr

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INT 1A - PCjr - SET UP SOUND MULTIPLEXOR
        AH = 80h
        AL = 00h source is 8253 channel 2
             01h source is cassette input
             02h source is I/O channel "Audio IN"
             03h source is sound generator chip

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