Ok, last stupid question for at least a few days !!
I'm trying to use Putty, instead of my VGA monitor that is connected to the I/O expansion module, and emulating a VT-100.
I have a USB cable connected from the DUE programming port to an available USB port on my desktop computer (running Win10-64bit). Windows Device Manager shows the USB connection to be COM4, so I setup Putty serial connection to be COM4, running at 115200.
When it makes connection to the Altair, the LEDs flash briefly, but no matter what I try, I can not get anything to display on the terminal window. I've tried AUX 1 down, to get that listing, but nothin on the terminal software. If I reconnect my VGA cable from the AD to my small monitor , all the data is still being written out to that monitor, and not to the terminal window.
What did I do wrong?