Got through a couple of practical issues, mostly related to incremental builds. But I'm ready to move on to UART control of the CPU. Some UART code would be nice on the breakout board. I can use the FTDI for that. FTDI bus B is connected to: PIO0_13 B12 RS232_Tx_TTL PIO0_14 B10 RS232_Rx_TTL Maybe do this in asm_tools first.