OK, this is where my electrical ignorance is going to show. I actually had some good progress today creating a VGA solution for my 65C02 based computer. But before I do that, I thought it would be easier to just use an Arduino to test connectivity and pass commands to the C3.
If you look at the attachment, you will see a breadboard. That breadboard is split in the middle, meaning that the left and right sides are normally isolated. So my logic was to let the Arduino provide both 3.3V and 5V power to the board where I will use level converters to talk to the C3. So it's hard to tell, but the right side has 5V and the left has 3.3V.
Now, I did proceed to connect a common ground to everything. Both sides of the breadboard, the Arduino and the C3. (Sorry, analog power is not my expertise!)
After doing so, everything works fine but I've noticed an odd (to me) behavior. Whenever I power cycle the Arduino, the C3 reboots and vice-versa. At the moment, the only connectivity they have is GND.
So I am curious as to why this happens and, more importantly, will I cause any damage anywhere?
Thanks for any information!