5 Oct
2018
5 Oct
'18
4:04 p.m.
On 10/5/2018 3:43 PM, Fred Cisin via cctalk wrote:
On Fri, 5 Oct 2018, steve shumaker via cctalk wrote:
I have the MPI version of this manual.? There is also a schematic for
the board I grabbed somewhere.
I've scanned something called the "MPI
Flexible Disk Drive
Interfacing Guide" for the Model 51/52 floppy units
Is that the same as:
http://www.osiweb.org/manuals/MPI_B51-B52_Product_Manual.pdf
?
Q: Is the 91/92 being asked about merely a 96TPI
version of the MPI
B51/B52?
I believe it is.
The QT Systems ad in Infoworld that Google comes up
with as an early
hit says 77 track (not 80).? It correctly refers to the B51 as "Sgl
sided, Sgl/Dbl Den", but refers to the B52 as "Sgl Sided, Dbl Den",
rather than double sided single/double density.
So, although 77 V 80 tracks is a definite possibility in those days,
the reliability of the specs in that ad are questionable.
The B51 was the first non-SHugart 5.25" drive that I ever had.
substituting it for the SA400 was truly trivial.
Motor speed seemed to wander a bit, but the track alignment held more
stably than the SA400.
--
Grumpy Ol' Fred???????????? cisin at xenosoft.com