It was mentioned recently that App Notes are more useful than data sheets. I agree and have been digging to find some. Since there was a discussion on this earlier, I started with floppy data notes. First two are from CDC and are for using the WD 1793 and NEC 765 chips to interface floppies. Includes a lot of wave shapes and notes on the data separater and PLO. I loaned them to Al K. to scan and put up on his site. He is pretty loaded down right now so give him plenty of time to process. I found the AMD bit slice App Notes but found someobdy had already put them up on the internet. So into the eBay box they go. I found a couple more on the old cartridge drives from CDC. I don't know if these are worth the effort to copy - the drives are long gone. Any opinions? I also loaned him two of the Kludge Komputer Kompany articles from Datamation. They showed up on this list recently too. And I'm certain they will be enjoyed by those who haven't seen them before. Billy