On 07/05/2007 03:05, Charles H. Dickman wrote: I've got the fiche, but no way to scan it or print it :-( The listing is quite long. I've done that, a long time ago (1991). I can't remember the details, but I recall I had to understand a whole lot of things in the table that the formatter uses. Something like 34 entries, not just half a dozen. Some are easy, of course, like number of heads, cylinders; some are easy to copy from other entries, like the gap lengths; some aren't hard to work out, like the "media word" which is an encoded version of the drive name. It gets a bit more interesting if you try to do the same with the tables in the RQDX2 ROMs, which I also did. And the RQDX2 ROMs contain a checksum :-( -- Pete Peter Turnbull Network Manager University of York