X-Hacker.org- Interrupts & Ports

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        Output character

        Entry:
          AH = 00h
          AL = character
        Return:
          AH = status bits
            0 = time out
            1 = unused
            2 = unused
            3 = I/O error
            4 = selected
            5 = out of paper
            6 = acknowledge
            7 = not busy

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