16 Apr
2001
16 Apr
'01
6:46 p.m.
On Mon, 16 Apr 2001, Eric Chomko wrote:
> Micropolis drives used 77 tracks for their
drives. Beyond that my
> memory is vague. We used to sell them with Sol-20s as Helios disks
> were not as reliable.
Micropolis had 2 major models of their 5.25" drive. One was 48TPI, with
35 tracks (maybe 40), and was essentially interchangeable with the Shugart
SA400. It was fairly slow stepping, since it used a helical lead screw.
But it was a nice drive for TRS-80.
The other was 100 TPI, with 77 tracks, not to be confused with the far
more common 96TPi 80 track drives. There is a somewhat rare Tandon
TM100-4M drive that can be used as a substitute for the Micropolis.
(Some think that the 'M' stands for Micropolis as replacing the Micropolis
100TPI is its only use.)
BTW, Micropolis also had their own operating system. I think that it ran
on TRS-80.
--
Fred Cisin cisin(a)xenosoft.com
XenoSoft http://www.xenosoft.com
PO Box 1236 (510) 558-9366
Berkeley, CA 94701-1236