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. 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. mike ----- Original Message ----- From: "Greg King" <firstname.lastname@example.org> To: <email@example.com> 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 2011-10-22 17:00:06
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