as stated before I am a complete noob to not just midibox but electronics in general, so be gentle!
So I have just finished building my sammichSID including voltage checks, and have gotten as far as the firmware upload and when I hit “Query” in MIOS I get a “No Response” message. I have tried all steps in: http://www.ucapps.de/howto_debug_midi.html and cannot get the loopback to work. I also tried doing the loop back from JMO and JMI and still nothing.
I do get a download request when I power on the unit and a “Ready” message on the screen.
I have posted pics from every angle I could see being relevant, in case some-one notices a bad solder joint. Any and all ideas are welcome.
Thanks for adding good quality pics with good lighting!
I am sure your issue will be solved, my first guess would be to check, that your MIDI interface is not on the MIDI device blacklist (-> wiki).
When I first built my MB6582, I ran into a similar issue, and it was because of an AKAI MIDi device that misbehaved… and which did not allow me to query the device or upload anything, i switched it and everything worked at once…
Edit:
Another thing - should it not be a 6N138 optocoupler in the IC socket in the middle of picture one, close to the midi ports and not a 24LC512 bankstick IC?
Me iz not a Sammich owner, but that is very likely to be your problem with MIDI communications.
I made sure to get a whitelist fella…it’s why it has taken so long to build! Had gone through a couple of different interfaces before I even realised there was a whitelist!
Ill check that IC now and if that’s the problem then I am in fact an idiot!
You are most welcome - enjoy your fantastic new synth!
I don´t think you´ve burned it, just compared the datasheets - both have vcc on pin 8, which is a good sign, so I´d give it a try, but no guarantees - you can also test/use your sammich without this bankstick ic and order another one cheap when shopping for electronics next time… you will just have a little bit less patch storage.
