It's 80 tracks according to the C900 Floppy Specifications document where it talks about the number of sectors per track. Document is here: https://vintagecomputer.ca/files/Commodore/C900/C900%20Floppy%20Specification.pdf Santo On Thu, Jan 11, 2024 at 8:10 AM Francesco Messineo < francesco.messineo_at_gmail.com> wrote: > On Thu, Jan 11, 2024 at 2:03 PM Francesco Messineo > <francesco.messineo_at_gmail.com> wrote: > > > > On Thu, Jan 11, 2024 at 1:58 PM Santo Nucifora <santo.nucifora_at_gmail.com> > wrote: > > > > > > Just to clarify: > > > > > > The 8250/SFD-1001 uses a Matsushita JU-570 or JU-570-2 drive mech. > The C900 uses a JA-560-012 drive mech and the serial number on mine is in > the 100s. I have never seen another drive in the wild. Other than the > C900 documentation, I have not been able to find any other info on these > drives. > > > > according to this document: > > > https://retrocmp.de/fdd/panasonic/Panasonic_JU-475-4_Service_Manual_OCR.pdf > > The JA-560 is a 96 TPI drive > Ok maybe this can be indeed a too quick conclusion, the -012 > additional part number may indicate a different head actuator that > makes it a 100 TPI drive. Indeed there seems to be no documentation > about these drives. I would just try to find information about the > disk format, 80 VS 77 tracks would clarify the issue. > Frank > >Received on 2024-01-11 15:00:16
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