Search found 295 matches

by SomeGuy
Thu Oct 22, 2015 12:17 am
Forum: Support
Topic: IMSAI 8080 shugart 8" SSSD CP/M floppies
Replies: 29
Views: 5758

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

It would be easier to tell if they were all sampled in the NEC drive. Orig workdisk has some incorrectly written sectors on the first couple tracks. 1: Of the ones marked "orig", yes, it looks like they were originally written properly at 360RPM. However I can see that you have since writt...
by SomeGuy
Wed Oct 21, 2015 9:32 pm
Forum: Support
Topic: IMSAI 8080 shugart 8" SSSD CP/M floppies
Replies: 29
Views: 5758

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

Copying between the two drives like that should work as long as the first can read them. Or you can post Kryoflux dumps here and I'll convert them to ImageDisk (or I can show you how) Yes, there is some flexibility in speeds that floppy disk microcontrollers can read the data. They have to be flexib...
by SomeGuy
Tue Oct 20, 2015 5:48 pm
Forum: Support
Topic: IMSAI 8080 shugart 8" SSSD CP/M floppies
Replies: 29
Views: 5758

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: 5758

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 ...
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: 1728

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: 1960

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: 719

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 &qu...
by SomeGuy
Fri Oct 02, 2015 4:36 am
Forum: Support
Topic: write G64 images back to a disk
Replies: 15
Views: 2263

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: 1978

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: 3423

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 a...