ManuTester
ManuTester
This is a bug. isalpha and isdigit take an int, but they expect a value of 0..255 (or EOF) and not -128..127 One is supposed to cast a char into...
While you're at it, you cannot turn off the termination by just removing the 5v and GND from the resistors, because the resistors are still linked and cause a connection...
Just a short note: I have experienced the same problem: I have libusb-win32 v1.2.2.0 driver installed for USBasp. Stock avrdude 6.3 downloaded here: http://download.savannah.gnu.org/releases/avrdude/avrdude-6.3-mingw32.zip works absolutely fine, avrdude 6.3.0-arduino2 does...