I get the same issue with teh 1284P using Mighty1284 Optiboot (Bobuino pinmap).I can upload Blink but not larger sketches. I eventually gave up and just program via ISP. It's a bit of a pain for serial monitor as I have to keep switching my USB>TTL adapter to monitor, but I'm just going to order another cheap one to use with MTTTY for monitoring.I have seen mention that trying a swap of the crystal resonator, or switching to a ceramic resonator can cure it, but I've not tried that as yet.If anyone does know a link to a definitive fix then it would be useful to knoe.
both put very close to the TX pin of the Arduino 1284P. Also, cut a little the pins of the capacitor.
Was that some specific date-code lot of parts? I have never seen that happen.
Quoteboth put very close to the TX pin of the Arduino 1284P. Also, cut a little the pins of the capacitor.Don't you mean the Rec pin RX0?Lefty