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.
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 ci...@xenosoft.com
