And high density is a bit of a misnomer, it is still double density, just a faster data rate. The format is almost if not completely identical to 8 inch dsdd disks.
"Quad density" term in the datasheet seems to be misleading. As far as
I know the "quad density" name was used for 5.25" / 720 KB disks, that
use the same data rate of 250 KB/s as 5.25" / 360 KB or 3.5" / 720 KB
disks, both called "double density" or DD. 720 KB / 5.25" disks just
use 80 tracks instead of 40 tracks in 360 KB disks.
500 KB/sec transfer rate used by disks commonly known as "high
density" or HD - 3.5" / 1.44 MB and 5.25" / 1.2 MB.
2.88 MB floppies (extended density or ED) are using 1 MB/s transfer
rate.
FDC9266 is also capable of supporting 500 KB/s data rate (both N8VEM
Disk I/O V3 and Zeta SBC work great with 1.44 MB disks), but its
datasheet doesn't mention data rate at all.
Thanks,
Sergey
On Jun 21, 10:33 am, Tregare <tre...@gmail.com> wrote:
> By quad density does that mean 2.88 mb drives?
> On Jun 20, 2012 11:13 PM, "Sergey" <skis...@gmail.com> wrote:
>
>
>
>
>
>
>
> > Hi Wayne,
>
> > I actually tested both Zeta and Disk I/O V3 with FDC9268 while ago and
> > it worked great with your firmware without any modifications. It is
> > completely pin compatible with FDC9266, but requires doubled clock (16
> > MHz instead of 8 MHz). I compared the datasheets of these two ICs.
> > They are almost the same, but apparently FDC9268 has better data
> > separator. It was more expensive (I think I paid $10 for one when
> > FDC9266 was $4), but now I see that UTsource lists both ICs for $5 on
> > eBay.
>
> > Thanks,
> > Sergey
>
> > On Jun 20, 10:09 pm, Wayne Warthen <wwar...@gmail.com> wrote:
> > > Thanks Bob.
>
> > > That is interesting. Perhaps something new to play with...
>
> > > -Wayne
>
> > > On Wednesday, June 20, 2012 9:13:10 PM UTC-7, Bob Devries wrote:
>
> > > > Wayne, from a brief look at the data sheets, the FDC9268 is capable of
> > > > quad density operation, and requires a 16MHz clock.
> > > > The FDC9268 and FDC9266 appear to be pin compatible.
>
> > > > Regards, Bob Devries
> > > > Dalby, QLD, Australia
>
> > > > ----- Original Message -----
> > > > *From:* Wayne Warthen <wwar...@gmail.com>
> > > > *To:* n8...@googlegroups.com
> > > > *Sent:* Thursday, June 21, 2012 1:49 PM
> > > > *Subject:* [N8VEM: 13909] FDC9268
>
> > > > Hi Sergey,
>
> > > > I noticed you mentioned an FDC9268 chip in another post. I was not
> > aware
> > > > of this chip. I guess it is pin compatible with the FDC9266 I am
> > currently
> > > > using in Zeta and DiskIO, but just needs a faster clock? Is it better
> > than
> > > > the FDC9266 in any way? Wondering if I should consider swapping my
> > 9266's
> > > > for 9268's...
>
> > > > Thanks!
>
> > > > Wayne
>
> > > > --
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