SECRET_MIDI_OUT?
  • Titus RaindropsTitus Raindrops

    I was looking at the schematic for the digital control board and noticed that pin 17 of the ATMega is leading to something labeled SECRET_MIDI_OUT – JP1.

    On the PCB it seems to be a dead end just before the header.

    What is it? Anyone know?

  • pichenettespichenettes

    It is the TX port of the second UART of the ATMega644p. During development it was used to pipe data out, first through a USB>serial dongle ; then through a second midi connector.

    Currently, its sole use is to send CV data in digital format to the digital filter board.

  • Titus RaindropsTitus Raindrops

    You won’t believe me, but that was my guess. I was really hoping that it was some sort of treasure map.

    I’ll keep looking…

  • 6581punk6581punk

    But given it is a synth, having more MIDI outputs isn’t a lot of use :)

  • Titus RaindropsTitus Raindrops

    I grant you, it was more interesting when it was a secret…

  • yewtreemagicyewtreemagic

    Should have left well alone then ;-)

    Sometimes it’s better not to know.

    Martin

  • schrabschrab

    The little secret pin no one should know about.
    Revealed veil of mystery never let you sleep in calm.
    This is the price for curiosity, this will never be unseen.

  • 6581punk6581punk

    Maybe unexplained pins should be treated the same way as undocumented jumpers?

    As Dave Haynie (hardware engineer at defunct Commodore) used to say:
    “NEVER EVER mess with a PCB jumper you don’t understand, even if it’s labelled “SEX AND FREE BEER”

  • fcd72fcd72

    Thats what i will include on my next PCB......

  • Titus RaindropsTitus Raindrops

    Schrab, I think that’s haiku?

  • fcd72fcd72

    @Titus
    Now that you mention that… maybe i should also try to solder sober?

  • Titus RaindropsTitus Raindrops

    Let’s take a vote: who thinks DMM solders sober? He produces the neatest builds ever known…

  • schrabschrab

    Titus, some kind of. I have not classified it yet.
    whispering: who is DMM?

  • Titus RaindropsTitus Raindrops

    He is the guy that built the programmer/xt in this thread.

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