Early 3.5" Floppy Drives

[Chuck Guzis]

On 12/15/2005 at 6:01 PM Allison wrote:

>Save for wrtclk controls that pin21 not the clock on pin19

Ya got me, Allison!   Pin 21 it is.  Curious thing that it must be present
to READ also, according to specs.  So, what's the lowest clock speed I
could run the 765 at and still be assured of reading 8" FM?

>I have the distinct advantave of having supported the part in the field 
> as "factory" for over two years and playing backup for the product 
>engineer reponseable for the part for another two years while at NEC.
>Any question I didn't have answers to were likely propritory. 

Back when I was still doing floppy controller design, it was the 1781,
which doesn't divorce write clock from the master chip clock.

Cheers,
Chuck