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 Frank IZ8DWF > > Hope this helps. > Santo > > > > On Thu, Jan 11, 2024 at 7:15 AM Francesco Messineo <francesco.messineo_at_gmail.com> wrote: >> >> On Thu, Jan 11, 2024 at 1:04 PM Michal Pleban <lists_at_michau.name> wrote: >> > >> > Hello! >> > >> > Francesco Messineo wrote on 10.01.2024 16:45: >> > >> > > according to this page >> > > https://www.zimmers.net/cbmpics/c900.html >> > > The 900 has a 96 tpi floppy drive, the 8250 has (for sure) 100 tpi >> > > drives. >> > >> > I am not entirely sure that this info is correct (see how it also says >> > it's 1.2 MB whereas the disks have in fact 1.0 MB capacity). I do know >> > that the disk drive interface is identical to the one used in the >> > 8250LP. The C900 documentation states that MFM support is incomplete, >> > and only GCR is used in the disk controller code, so they would not need >> > to bother with 96 TPI MFM disks. The C900 mech is also outwardly >> > identical to the one from the 8250LP except it has a grey faceplate, so >> > I think there's good chance it is simply the same 100 TPI mech. >> > >> >> if it supports only GCR (I assume the same format as the 8250?) then >> why you need >> to bother with MFM ? >> If you know the actual format used it's easy to tell what is the >> mechanism they used, if it's 80 tracks per side, then it's 96 TPI, if >> it's 77 tracks per side, then it's 100 TPI. >> Frank >> > Regards, >> > Michau. >> > >>Received on 2024-01-11 15:00:03
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