The quality of the video is terrible, but this shows you what is involved to upgrade your 400 to a potential of 52K
An odd video corruption occurs with the bottom RF shield in place, but is fine with it off. I've tried this with my complete library of files and it works like a charm.
This kit came from Juergen van Radecke (tfhh on Atariage)
http://atariage.com/forums/topic/267042-new-hardware-atari-400-ram-card-4852-kb-external-os-rom/page-3#entry3833918
