Software-based floppy disc data separator

On 15 Jun 2010 at 23:49, Philip Pemberton wrote: Congratulations! I've got a somewhat thornier problem here--a disk that had some tracks written by a drive with what I can only surmise is a slipping belt. Not even the traditional WD9216 can make sense out of it. I'm going to try some tweaking of my own to see if I can read the data with some agressive software. My algorithm adjusts all three MFM peak positions (t, 1.5t and 2t) more or less independently. My hope is that it may compensate for some "bit crowding" effects. Of course, there's always the possibility that it'll have the opposite effect. I'll let you know how it all turns out. If you want to try a run at the data with your own algorithm, I can forward an image file recorded with the 28.3 MHz (ISTR) Catweasel clock. The format is nonstandard (i.e. different IDAM conventions, but is otherwise fairly straightforward). --Chuck