That document also mentions 96TPI. Santo On Thu, Jan 11, 2024 at 8:14 AM Santo Nucifora <santo.nucifora_at_gmail.com> wrote: > 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 15:00:31
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