Search found 172 matches

by SomeGuy
Mon Nov 12, 2018 9:42 pm
Forum: Dumping
Topic: Two Questions
Replies: 4
Views: 59

Re: Two Questions

Correct, there is no real error checking with a flux preservation stream dump. But the upshot is you don't have to re-read the disk again and again if you don't know the correct sector decoding parameters (some formats are much more complex). That does mean you may have to re-dump the disk if you fi...
by SomeGuy
Mon Nov 12, 2018 7:14 pm
Forum: Dumping
Topic: Two Questions
Replies: 4
Views: 59

Re: Two Questions

From what I have seen, the AT&T Unix PC uses standard 48TPI 5.25" double sided double density media and drives. They use MFM encoding with 512 byte sectors. There are at least two formats, one that uses 8 sectors per track and one that uses 10 interleaved sectors per track. Obviously these are not D...
by SomeGuy
Mon Nov 12, 2018 5:31 pm
Forum: Support
Topic: Advice needed on floppy drive head cleaning kits...
Replies: 3
Views: 63

Re: Advice needed on floppy drive head cleaning kits...

Inspect the disks? Do you mean inspect them for particulate contamination or mold? Exactly. Before putting an unknown disk in your floppy drive for the fist time, hold it up to the light at various angles to view the disk surface. Put two fingers through the hub and gently turn the disk cookie to s...
by SomeGuy
Sun Nov 11, 2018 10:46 pm
Forum: Support
Topic: Are there any 5.25'' floppy drives that are officially supported and which can read "flippy disks"?
Replies: 4
Views: 65

Re: Are there any 5.25'' floppy drives that are officially supported and which can read "flippy disks"?

The Kryoflux will not read flippy disks that have only one index hole opening unless you have a modded floppy drive. An alternative for data disks is simply to punch a second index hole through the floppy disk jacket (not the cookie!). Then just flip the disk over. But obviously you would not want t...
by SomeGuy
Sun Nov 11, 2018 10:28 pm
Forum: Support
Topic: Advice needed on floppy drive head cleaning kits...
Replies: 3
Views: 63

Re: Advice needed on floppy drive head cleaning kits...

Do NOT use old cleaning fluid. It has probably degraded and can become nasty. It is just Isopropyl alcohol - get some fresh stuff at Walmart. The cleaning disk itself should be fine. Does it appear dirty? What kind of material is theirs made out of? If it is a sort of plastic-feeling white fiber, yo...
by SomeGuy
Sun Nov 11, 2018 2:55 pm
Forum: Support
Topic: No flux reversal found (with log)
Replies: 2
Views: 41

Re: No flux reversal found (with log)

Could you post an example flux preservation dump? At a glance, "-dd0" should, I think, be "-dd1" as Amgia disks are low-density, although most 1.44mb drives figure this out themselves and ignore that parameter. Yes, it is confusing as the kryoflux refers to the density line's logic level which is no...
by SomeGuy
Wed Nov 07, 2018 10:16 pm
Forum: Dumping
Topic: HP 86B Disks
Replies: 7
Views: 101

Re: HP 86B Disks

Ok, looking at that under the HxC software tool, I see single sided double density 70 tracks, 16 sectors of 256 bytes plus one additional 128 byte sector on each track. It shows no decoding errors and all sectors match their CRC. The sectors have an interleave and sector skew. It looks like the kryo...
by SomeGuy
Wed Nov 07, 2018 12:45 am
Forum: Dumping
Topic: HP 86B Disks
Replies: 7
Views: 101

Re: HP 86B Disks

Posting the flux preservation dump would be most useful. I'm not specifically familiar with HP-80 series disks, but I am aware that some HP disks from that era used odd sector layouts that can not be properly stored in IMG or ImageDisk format. The HP Museum web sites uses mostly Teledisk format. Wha...
by SomeGuy
Sat Nov 03, 2018 10:37 pm
Forum: Support
Topic: Does the Kryoflux firmware support "track shifting"...
Replies: 3
Views: 112

Re: Does the Kryoflux firmware support "track shifting"...

The kryoflux does not care where the tracks actually begin. When decoding to a sector image file, it will look anywhere. You should be able to read the first side of an Atari 400/800 disk with no modifications even though the tracks are not aligned to anything. There are actually two separate proble...
by SomeGuy
Fri Oct 26, 2018 6:07 pm
Forum: Support
Topic: 8" CDC/MPI drive says max track is 41 ??
Replies: 8
Views: 238

Re: 8" CDC/MPI drive says max track is 41 ??

I'm a little confused here about what you are trying to do. If you can read the first 40 tracks then your adapter is correct, at least for reading. I just did a little test with my 1.2mb 5.25" drive. If anything blocks the head from reaching track 80 during calibrate, then it assumes there are 41 tr...