I have some Core memory from a guy who worked at Four Phase. They're made by Fabri-Tek and he remembers these being used in some IBM system - the best he can remember. The really cool thing about this is that it's assembled in a way where it folds up. I have some pics at the links below. I'm hoping somebody might know what system this came from. I also have closeup pics of the board, serial, and part numbers too. Then maybe I can find a manual for this. With some luck and some hacking, I can then wire an interface to this for my homebrew PDP-8. http://www.flickr.com/photos/ragooman/5788472143/in/photostream http://www.flickr.com/photos/ragooman/5788471265/in/photostream http://www.flickr.com/photos/ragooman/5789025174/in/photostream http://www.flickr.com/photos/ragooman/5788469637/in/photostream http://www.flickr.com/photos/ragooman/5788469117/in/photostream http://www.flickr.com/photos/ragooman/5789023250/in/photostream =Dan