Scan of Micro Peripherals Inc MPI 91/92 Product Manual Avail?

[jim stephens]

On 10/5/2018 3:43 PM, Fred Cisin via cctalk wrote:
> On Fri, 5 Oct 2018, steve shumaker via cctalk wrote:
>> 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
> ?
>
I have the MPI version of this manual.  There is also a schematic for 
the board I grabbed somewhere.
> 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
>
>