I posted a youtube video after getting the RAM sizing code implemented. The board properly detects the 32K SRAM part. Arduino Mega in the video is attached via a 6-pin ICSP header and is only providing power. Astute viewers will note the lack of a TX line going to the UART... this is because my ROM monitor doesn't actually handle input yet. :D

Next step will be a memory exerciser for the RAM. I already test the first 1K (where stack/vector table resides), but I needed to size the RAM prior to testing the remaining addresses.