On 2011-09-22 22:02, Wolfgang Moser wrote: > Hi Olaf, > > Rhialto schrieb: >> On Wed 21 Sep 2011 at 23:31:28 +0200, Wolfgang Moser wrote: >>> so then get a Panasonic JU-475-4 or -5 drive and file away the >>> mechanical stop a little bit. The rails and other mechanical parts are >>> long enough to allow the head to step back to track -4 (ca. 2.15mm). >> >> Won't that mean that if you format a new disk on it, it will have the >> tracks on the top offset by (about) 4? > > I did not test this yet, but there is still the optical track-00 sensor. > Because I didn't touch it it should be still correctly aligned so that > disks get formatted correctly. The Kryoflux people reserved one of the > lines of their controller to temporarily disable the track-00 signal so > let the drive controller IC "think" that the sensor is not hit yet. If > this line is not active, then the sensor is in fact hit, recognised by > the drive controller and therefore the head is repositioned to track 00. > > Does this make sense for you? > I'm afraid that I'm short of some background knowledge here. I guess that there is only one track zero sensor that works for both heads as they are mounted on the same rails ? Using a standard 5.25" floppy drive - at what level is track zero signalling enforced ? Is the track zero signal "information only" to the controller/software that track zero is reached ? Or will the drive electronics *actively* prevent any further head movement in that direction once track zero is signalled. When the track zero sensor triggers (on a standard 5.25" floppy drive) the top side head is at physical track zero while the back/flip-side is at physical track 4 - is that correctly understood ? /Uffe Message was sent through the cbm-hackers mailing listReceived on 2011-09-23 09:00:08
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