The sound card (at least the original Sound Blasters) is all at cmos or TTL
level (basically 5 volt around 1mA signals).

To get real midi signals into/out of the sound card requires a midi adaptor
that just converts the output up to 5 volt, 20mA current loop (with a 220
ohm resistor on both wires of the loop) and a fast opto coupler on the input
(with yet another 220 ohm resistor in series).

So, yes, you can take a TTL level signal directly out of the sound card pin.
But it will probably be an inverted signal - expecting to be re-inverted in
the midi adaptor.  Also the midi data rate is fairly fast and a bit crazy
(non divisible by 2).  Good luck.

Bye.

        -----Original Message-----
        From:   Michael Waits [SMTP:cpmikey21@YAHOO.COM]
        Sent:   Wednesday, 16 August 2000 5:32
        To:     PICLIST@MITVMA.MIT.EDU
        Subject:        [PIC]: MIDI input and audible output

        Hello, I am fairly new to the world
        ofmicrocontrollers, and I was wondering if anyone had
        ever thought about converting the MIDI code which
        comes from the sound card on some pc's to something
        which may be heard. Which is what I am trying right
        now. I want to have the pic play monophonically, so I
        need only worry about one note at a time. I am trying
        to only have one output bit, which is a square wave
        set to the frequency of the note.  Setting the volume
        of the note can be done later, butnow I am stuck,
        because I don't know if the pin on the sound card can
        be connected directly to the uart onthe PIC. If anyone
        can shed some light on my problem,it would be greatly
        appreciated.

        Thank you in advance
        Michael Waits


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