Soft Sectoring a RK05

On Saturday (09/07/2013 at 03:44PM -0700), Al Kossow wrote: I think your micro has to be a little smart and isolate the index pulse from all the others and become synchronous with it. Then it can synthesize the 12- or 16- sector pulses by simple "dead reckoning" timing after using the leading edge of the index pulse as the trigger. The sector to sector duration will be one value but the sector to index duration will be half of that and then you know you just found the index mark. The micro then generates an outbound index pulse and the 12- or 16- synthetic sector pulses, the first of which comes sooner than the others, and then goes back to finding the next inbound index pulse... rinse lather repeat. Use a decent stability crystal or oscillator (as opposed to some on die RC osc) to clock your micro and you should have it. I have done something very similar to emulate 10- and 16-hole hard-sector floppies with 3.5" soft-sector media and it works very well. http://sebhc.lesbird.com/storage/storage.html#HARD_SECTOR_FLOPPY_EMULATOR Chris -- Chris Elmquist