3 Jul
2016
3 Jul
'16
5:41 a.m.
On Sat, Jul 2, 2016 at 10:15 PM, Peter Coghlan <cctalk at beyondthepale.ie>
wrote:
Thanks everyone.
All working now - there were two issues at play.
1) Wrong settings for DTC. Used the linked-to document to change to
1024Byte sectors, tracks 0-79 and sectors 0-5. I record the stream file of
flux transitions as before (a preference in any event) and when I process
it with the aforementioned settings I get an 800KB .adl image file. This
mounts up in an emulator very nicely:
https://www.dropbox.com/s/hjgz3416htlryrm/Screen%20Shot%202016-07-03%20at%2…
2) The initial disc I used was an original disk for a game - SWIV. I
suspect that it either uses some interesting copy protection mechanism or
the media is faulty. The above method works for 9/10 discs but not the one
I originally selected for testing. Lesson learned - use known good media
or a selection of suspect ones.
-Austin.
Is the capacity of the diskette 800K? or is that
merely the name of the
type of the diskette, with an actual capacity of somewhere between 640K and
800K?
If the actual capacity is 800K, with MFM, then it would probably be 80
track, double sided, with either 10 512 byte sectors or 5 1024 byte sectors
per track. (can't get up to 800K with "normal" WD style MFM with 256
bytes
per sector, and 512 byte sectors are a little tight)
The original ADFS had 16 sectors of 256 bytes per track. However, it
appears
that more recent ADFS formats use 5 sectors of 1024 bytes. There are more
details here:
http://mdfs.net/Docs/Comp/Disk/Format/Formats
Regards,
Peter Coghlan
