I've got the reference manual for the 2.8MB one. How was the embedded servo recorded--and in what format?
Thanks much for information!
Given that the number of blank formatted disks for these things are probably outnumbered by the number of drives still in existence, I've wondered about being able to repurpose them a bit.
A lot of old 5.25" drives developed alignment issues and reading disks written long ago can be a real headache. I keep a few drives around with varying amounts of misalignment built in for this purpose. While it's not possible to do much about azimuth, one can, with a little determination either use a previously misaligned drive or intentionally misalign one to work.
My thought was to directly control the steppers and simply use read success or failure to micro-adjust the position to read old conventional floppies. Do you think that this might be a workable idea?
Again, thanks for the input.
Head cleaning is easy--just remove the 4 screws holding the shield in place. There's the head, right in front of you. I wish that all drives were that easy to clean. However, when you replace the shield, note that the front and rear edges have a small "lip" bent into them and that you'll need to make sure that the shield's in place before you re-install the screws.
On the PCB bottom of the 6.6 PCB, the second set of switches is labeled DCHG, RDY, 600 and SKCPT. Well, DCHG and RDY are obviously "disk change" and "ready" for output on pin 34. 600 must either enable or disable 600 RPM mode. SKCPT is a bit of a mystery, however.