Great achievement, congratulations I like that you also tried Nerd Ralph's 3-Pin configuration and got it to work. I tried it once but somehow it didn't connect to the radio, so discarded this idea. Also I thought it might be cheaper (from a memory point of view), just to use one bus. Nice work on stuffing all this in 8K It would be great if you reported in a couple of weeks how stable it's running. Did you have a chance to measure the power consumption of the hole system?