26 Aug
2021
26 Aug
'21
12:46 p.m.
On 8/25/2021 3:57 PM, Fred Cisin via cctalk wrote:
On Wed, 25 Aug 2021, Jay Jaeger via cctalk wrote:
35 track. The aforementioned "Mod I" models.
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???????????? cisin at xenosoft.com
JRJ