Search found 283 matches

by SomeGuy
Tue Oct 20, 2015 5:48 pm
Forum: Support
Topic: IMSAI 8080 shugart 8" SSSD CP/M floppies
Replies: 29
Views: 5624

Re: IMSAI 8080 shugart 8" SSSD CP/M floppies

The good news is, the tracks in these dumps are where they should be. Zero matches up with zero and so on. The bad news, according to these Kryoflux dumps, your Shugart drive appears to be spinning at 300RPM instead of the correct 360RPM. - That will cause the interoperability problems you described...
by SomeGuy
Mon Oct 19, 2015 4:19 pm
Forum: Support
Topic: IMSAI 8080 shugart 8" SSSD CP/M floppies
Replies: 29
Views: 5624

Re: IMSAI 8080 shugart 8" SSSD CP/M floppies

Something seems to be off with your disk or drive. I decoded the streams with the PCE tools (It gives more verbose information), and the track zero contains sectors with track IDs of "3". This continues up to track 73 that contains sectors with track IDs of 76. So either your drive is way out of ali...
by SomeGuy
Fri Oct 16, 2015 5:06 pm
Forum: Support
Topic: Issues producing images of old IBM PC 5.25" disks
Replies: 5
Views: 1701

Re: Issues producing images of old IBM PC 5.25" disks

This is a common problem with early 1980s PC disks. In general most 160K or 320K (8-sector) disks will have a DOS 1.x boot sector that lacks the BPB. DOS 1.x only supported these two formats. If a vendor provided disks in these formats, the software is probably intended to be compatible with DOS 1.x...
by SomeGuy
Fri Oct 09, 2015 12:57 am
Forum: Support
Topic: Apple II nibble image
Replies: 6
Views: 1938

Re: Apple II nibble image

At one time nibble files were popular on Apple II emulators, as it enabled them to run many copy protected titles that used less complicated protections (such as alternate sector header bytes). It may have also simplified the program code, but most emulators eventually supported 140K disk sector ima...
by SomeGuy
Wed Oct 07, 2015 4:21 am
Forum: Support
Topic: Tools for wiritng 400K/800K Mac sector images?
Replies: 1
Views: 712

Tools for wiritng 400K/800K Mac sector images?

Is there currently a tool that can convert 400K/800K Macintosh floppy disks images, either from sector image or DiskCopy 4.2 format, to a Kryoflux or SCP stream file for writing? It looks like the PCE tools can create a TransCopy image from from a DC42 file, but HxC doesn't seem to recognize the "mu...
by SomeGuy
Fri Oct 02, 2015 4:36 am
Forum: Support
Topic: write G64 images back to a disk
Replies: 15
Views: 2223

Re: write G64 images back to a disk

This drive really switches to 300RPM for low density?

Perhaps try "dtc -fbbsb.g64 -w -dd0 -v300 -d0" (or -dd1 depending which your drive is really using for low density).
by SomeGuy
Thu Oct 01, 2015 4:34 pm
Forum: Support
Topic: unwanted double step on 40 cylinder floppy drive
Replies: 10
Views: 1930

Re: unwanted double step on 40 cylinder floppy drive

It would be good if these stepping requirements were listed in the manual.
by SomeGuy
Wed Sep 30, 2015 2:36 pm
Forum: Support
Topic: A few questions, if you don't mind
Replies: 16
Views: 3397

Re: A few questions, if you don't mind

You have run in to some 1.44mb 3.5" drives that do not drop the head current for writing 720K disks? Do you know of a quick and easy way to test for that? Would these drives also lack the HD notch sensor? I know there are some garbage-grade USB floppy drives (Bytecc) that refuse to do 720k at all, b...
by SomeGuy
Wed Sep 30, 2015 5:11 am
Forum: Support
Topic: A few questions, if you don't mind
Replies: 16
Views: 3397

Re: A few questions, if you don't mind

1.44mb drives are 100% backwards compatible with 720k drives as long as the density line is set properly and the disk is appropriately density notched or non-notched. In practice, using a 1.44mb disk with the density hole covered "works" as a 720K. But you lose a little bit of reliability - there IS...
by SomeGuy
Sat Sep 12, 2015 4:17 am
Forum: General
Topic: Same ticket for new dumps?
Replies: 5
Views: 2013

Re: Same ticket for new dumps?

Am I correct in understanding that the Kryoflux won't read a disk at all if there is no Index pulse, even if the drive supports it? There is no way to ignore the lack of an index? (Or am I just badly mis-reading things again?) I do understand that would be "bad" for preserving original media, but th...