>>> i have floppydisks written by a tar, but they are formated with 17
>>> sectors/track and with 77 tracks per surface, each sector has 512
>>> bytes on a 5.25" media.
>>> How can i set parameters of the diskettes drivers to read (and perhaps
>>> write) it, this stupid format?

Hi,
the diskettes where written by an Xenix derivat on normal 5.25" Floppy
media. The HW had a programmable device under /dev, which also was
possible to use with the old ecma formats.
Yes, they wrote it with 2*77*17*512 Bytes on a 5.25" HD disc 8-[:]
But, the old HW isn't longer available :-(( and on the medias is
source code we needed.
Will try and see what will go.
Thanks!!!
Peter