Hahaha... I was just about to report the syntax issues in fsdevice-read.c :-). But, yes, REL behavior with .R00 files seems now to be correct. Previously, position commands would mysteriously extend the file even when no write had occured. Nice work, Olaf!
OOoof. Not sure what is going on, but I just tried this again with a D64 image and it provided the correct behavior. But, in the large something is flaky with this build. I've had it crash in flames for no apparent reason and several times it's become unresponsive and had to be killed. Is GTK-3 build of 3.4 r38766 expected to be stable on Ubuntu 18.04?
xpet 4040 not handling REL files correctly
I'm experiencing the same issue with my Xilinx adapter. I have to unplug / replug after every programming action or xc3sprog fails with above mentioned USB error. Is there any fix or workaround for the issue?