The title says it all. I need to modify Serial, to increase the Tx buffer size, but I can't find the source code....
I don't know about Windows, but I think I found it in Linux. It is in a hidden folder.
Search for SERIAL_BUFFER_SIZE
Thanks! In Windows it's in Users\username\Appdata\Roaming\.arduino15\packages\arduino\hardware\sam\1.6.4\cores\arduino\RingBuffer.h
I bumped it up to 1024. It's not like I'll ever use all the available RAM....