Wouldn't need to be decoded at all. Greaseweazle accepts the disk image format, then uses the data in the image file to create the equivalent flux on the fly as it writes to a disk. On Tue, Sep 17, 2024, 4:56 PM Jeffrey Brace <jeffrey@vcfed.org> wrote:
On Tue, Sep 17, 2024 at 11:51 AM Jeff S via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
I looked at the IMD files in HxCFloppy emulator. They are decoded as 77 tracks (probably a forced overread for that 77th track), double-sided, 15 sectors per track. I see a lot of binary data, but there are a few decodable sequences in some sectors that show portions of the alphabet, in sequence, in capital and lowercase letters. This may indicate that the decoded image data is correct. I've always found that if I can read a disk image cleanly in HxC Floppy Emulator, I can generally use it in Greaseweazle to write out to a disk. But ultimately, it's up the actual machine the disk is made for that will decide in the process works.
So do you think that you can decode the images and copy them to 8" floppies?
On Tue, Sep 17, 2024 at 11:17 AM djg <djg@pdp8online.com> wrote:
https://forum.vcfed.org/index.php?threads/does-anyone-have-a-working-8-inch-...
I took quick look at zip and files had extension imd so should be pretty standard. Life got complicated so didn't go any further.
-------- Original message -------- From: Jeff S via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Date: 9/17/24 11:05 AM (GMT-05:00) To: vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Cc: Jeff S <jsalzman@gmail.com> Subject: Re: [vcf-midatlantic] Next Repair Workshop Oct. 4 & 5
I used a Greaseweazle to both successfully image and recreate 8" disks
for
an OSI computer a couple years ago. Since it's flux based, as long at the track spacing for the 5110 disks are the same as conventional 8" disks, then it can theoretically be done using a Greaseweazle setup. I always bring my Greaseweazle kit with me to Workshops, so I expect to have mine available at the next one.
I would like to see what the image files are. If the images are pure flux, then I won't need to do much preparation to try and create a disk from those images. The Greaseweazle software recognizes quite a few popular (and uncommon) disk formats, and can recreate the flux transitions on the fly as it writes the data out to the track. The only caveat is, having a 5110 available to test out the disks. Greaseweazle works with flux resolutions down to 25ns, so that might not be an issue, but it would be nice to test them right away.
Jeff Salzman
On Mon, Sep 16, 2024 at 11:36 PM Jeffrey Brace via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
There is someone looking to make 8" disks from images that he has. He recently acquired a fully functional IBM 5110-3 (or 5120) with dual 8-inch disk drives. He found the image files to make 6 disks with various applications for this computer.
Is there someone that can make the disk images for him and bring to the repair workshop?
Thanks!
Jeff Brace VCF National Board Member Chairman & Vice President Vintage Computer Festival East Showrunner VCF Mid-Atlantic Event Manager Vintage Computer Federation is a 501c3 charity https://vcfed.org/ <http://www.vcfed.org/> jeffrey@vcfed.org