I put some information I've accumulated up on my web space. It's at <http://www.io.com/~trag> and look for the folder labeled "Floppy_Circuits". It's uploading at this moment (11am CDT) so it may be an hour or two from now before it's all up there. There are data sheets for the WD37C65C, WD37C65+ and WD92C32 in PDF. I also uploaded a scan of the National Semiconductor DP8473 datasheet as a series of JPEGs. If someone has that one as a PDF I'd love to get it in that more convenient format. The most interesting bit is the "Floppy Disk Data Separator Design Guide". This was included in the sales/information packet for the DP8473. It's 28 pages of information on how to design a data separator. Again, this is a collection of JPEGs. It's a little inconvenient to read on screen because I scanned it at 150dpi (so a 100% image is quite large) but when I tried 72 dpi it was too hard to read. The characters were chunky/incomplete at 72 dpi. The print in the actual booklet is rather small. 150 dpi was the lowest resolution that led to readable characters without eyestrain. I've accumulated this stuff because I would like to clone the external floppy drive for the Outbound Model 125 Laptop, but I'm not actively working on this project yet, so don't have any questions for the list at this time (unless someone knows an affordable source (~$.50 ea.) of WD92C32s). I hope this information is helpful. Jeff Walther