Well, I still think it's highly unlikely that the CBM-900 would use totally incompatible 100TPI disk drives/format, but I suppose anything is possible. If the Kryoflux can read the flux that would seem to suggest that you're on the right tracks ;-) and it just can't make sense of the actual layout. But good luck! mike ----- Original Message ----- From: "Uffe Jakobsen" <email@example.com> To: <firstname.lastname@example.org> Sent: Saturday, October 22, 2011 7:54 PM Subject: Re: CBM-900 floppy disk format/encoding > > > On 2011-10-22 18:01, MikeS wrote: >> I think we're all agreed that the SFD1001 uses the same format as the >> 8x50, >> namely DD, GCR, 100TPI, 500KB/side, and is essentially 1/2 of an 8250. >> > > Agree > >> But the question is what did the CBM-900 use, and I would think it much >> more >> likely that its 1.2MB UNIX disks would be industry-compatible HD disks >> instead of somehow squeezing an extra .2MB out of a DD disk that would >> not >> be compatible with anything at all. >> >> So I doubt that it was actually compatible with the SFD1001, but I'm just >> guessing. In any case, if no one comes up with a definitive answer, I'd >> suggest to the OP that he try using an HD drive and diskette and see >> whether >> it works. >> > > Given the fact that I've already tried dumping the disks with an 80 track > drive (HD) - I'm leaning more to my own conclusion which is: > > I need to get hold of a 100 TPI floppy drive and try that with my > kryoflux. > > Thanks for your input - I'll keep the list updates on my progress. > > Since sources document that aprox 500 CBM-900 prototype units were made > I'd have expected that this list was the (only) right place to hear about > owners of CBM-900 systems - but it is never too late for any of them to > speak up :-) > > Thx > > /Uffe > > >> ----- Original Message ----- From: "Greg King" <email@example.com> >> To: <firstname.lastname@example.org> >> Sent: Saturday, October 22, 2011 5:02 AM >> Subject: Re: CBM-900 floppy disk format/encoding >> >> >>> From: "William Levak"; on Sat., October 22, 2011; at 01:11 AM -0400 >>>> >>> >>>> On Fri, 21 Oct 2011, Ed Johnson wrote: >>>> >>>> > I have a SFD 1001 and it used DS/DD diskettes, NOT HD (High Density) >>>> > diskettes. >>>> >>>> The drive mechanism on the SFD 1001 is a Quad Density drive, >>>> compatible with DD, but not HD. >>> >>> "Quad" was a marketting gimmick. It wasn't related to single- and >>> double-density. It meant that the track density, not the bit density, >>> was "doubled". >>> >>> The 4040 format is 48 Tracks Per Inch, while the 8050 format is 100 TPI. >>> > > > > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2011-10-23 01:00:12
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