CWVG
Jay Jaeger
cube1 at charter.net
Thu Aug 26 14:46:57 CDT 2021
On 8/25/2021 3:57 PM, Fred Cisin via cctalk wrote:
> On Wed, 25 Aug 2021, Jay Jaeger via cctalk wrote:
>> I don't have that code, however a couple of points:
>> First of all, I think Vector Graphic actually used Micropolis drives
>> (and I suspect yours are because of the hard sectoring). I have
>> Micropolis drives on my Altair. Back in 2006 I imaged my floppies -
>> by reading the sectors on my Altair and transferring the data over to
>> my PC and saving an image file.
>> Note that at least for the 100 TPI Mod II model you'd have to use an
>> actual Micropolis drive or the tracks won't line up. I don't know if
>> that is also true of the Mod I drives which have a more standard
>> tracks per inch.
>
> Important points!
> Yes, Vector Graphics was 100tpi. That was not the only unusual aspect
> to their format.
>
> Yes, Micropolis ALSO made 48tpi single sided drives. I don't remember
> whether they were 35 track or 40 track; I used one for years on a TRS80
> (which wass 35 track); it was an exceptionally reliable, albeit heavy
> and slow-steppping drive.
>
35 track. The aforementioned "Mod I" models.
>
> For 100tpi, there also existed Tandon TM100-4M drives. The M stood for
> "Micropolis". One of the TM100-4M drives that I had did not have the
> 'M' on the label.
>
> --
> Grumpy Ol' Fred cisin at xenosoft.com
JRJ
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