pumodi Posted November 22, 2021 Report Share Posted November 22, 2021 (edited) Hey all! Pumodi here. I just recently got into MIDI Box building and put together a sammichSID (with 2 SwinSids). Build went pretty smooth but I'm currently stuck trying to upload the MIDI software to the PIC. I've been going through the MIOS midi troubleshooting tips and have gotten to the point where I did the 6n138 loopback test to no avail. So I'm fairly sure there is a short somewhere in the MIDI I/O portion of the board but am having difficulty identifying it. Any tips y'all might have would be greatly appreciated. Here's what I know: It's not the 6n138 optocoupler itself. I've put a few in the socket and nothing changed. I did everything here (http://www.ucapps.de/howto_debug_midi.html) up to checking the MIDI input section. I've done a few tests beyond that but the loopback tests are giving me pause. Oddly, if I plug a MIDI cable to a MIDI out port on both the Sammich and my interface the LED's on the bottom of the SwinSid's turn on, even without a power cable plugged in. Is that normal? Also, along that line of questioning, I don't know how to set up the power jumpers for the SwinSids. Do they require power like the 6581 or is it closer to the 8580? Any help y'all can provide would be extremely appreciated! <3 Edited November 22, 2021 by pumodi Quote Link to comment Share on other sites More sharing options...
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