Thanks to all.
Solved.
It was a multiple cause issue:
1st: BIOS Setting was incorrect (had to enable 1.2MB 5.25 rather than
3.5 which was it set to - an oversight in the firts place, that occured
to me).
2nd: Cable issue: I had a combined cable (3.5 " connector at the end and
edge connector second but last.
3rd: in combination with 2nd: DS0 jumper issue.
Anyway, I found a cable that had two edge connectors.
In the end it turns out that the floppies that were lying in a drawer
for 19 years, are producing read errors.
I also learnt about fdcontrol. Floppy interface has changed
significantly since Joerg Wunsch and Bruce Evans
worked on them in the early FreeBSD days back in 1995 :)
--
Christoph
Am 01.10.2010 19:18, schrieb Warren Block:
On Fri, 1 Oct 2010, Christoph Kukulies wrote:
I'm in the need of reading some data from old 5.25" floppy media
(1.2MB).
I lent 2 drives from neighbour institutes at the university and after
having recalled that the
floppies have to be enabled in the BIOS I'm now seeing the fd0 device
in dmesg (FreeBSD 8.0 RELEASE).
I can do a dd if=/dev/fd0 of=/root/fd0.dmp
The select light is lit, the head motor seems to get power but the
spindle doesn't spin.
Possibly a drive select issue. Some drives had jumpers or switches,
some cables have flipped-around wires so the connectors are specific
to one drive or another. If your cabling is straight-through with no
funny business at the connectors, set the drive to DS0. If the cable
has split out and flipped-over sections, DS1 should be set in the
jumpers --but then it depends on which connector is used. ...I think,
anyway, it's been a few years since I've had to use a 5.25.
I tried that with two TEAC drives to no avail.
Any clues what I may have forgotten? The drive is connected with the
edge connector and the end is open.
Does it need to be terminated?
None that I've seen.
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