17 Apr
2001
17 Apr
'01
1:38 a.m.
"Fred Cisin (XenoSoft)" <cisin(a)xenosoft.com> wrote:
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.)
Hmm, here I sit looking at one of a pair of Micropolis model 1115-VI.
It's a 5.25" full-height drive, serial 0372. Someone (not me) helpfully
wrote on it with a marker:
96 TPI
2 SIDED
5 1/4
Date codes on the ICs would seem to place its manufacture sometime
in early-mid 1983.
Was the someone with the marker perhaps mistaken?
Hard to tell from http://www.mfarris.com/know/floppy/floppy2.html --
that doesn't seem to get any more specific than
"SD"/"DD"/"QD"/"HD".
-Frank McConnell