CP/M

From: Don Maslin <donm_at_cts.com>
Date: Thu Jun 18 14:10:48 1998

On Wed, 17 Jun 1998, Tony Duell wrote:

> > Likewise the Commodore 8-bitters. In the early 1980s, I was one of the
> > first in my school (I was 14 or so at the time) to own a floppy disk
> > (yes, a disk, not a drive). I had heard of "flippy disks" with two
> > index holes, which you could turn over, thus using both surfaces in a
> > single sided drive. But I didn't realise you needed to give it a second
> > index hole.
>
> Incidentally the Siemens drives in my Z-90 have mouting positions (and
> pins on the PCB plugs) for a second index sensor and write-protect switch
> so that they can use a normal disk as a 'flippy'. None of my drives have
> this fitted, though
>
> -tony
 
I wonder if implemented if it would be necessary to let the read
electronics know which sensor it was reading to compensate for the
rotation positional difference. Or whether when reading the flippy
side it would simply wait longer to read the sector header.

                                                 - don
Received on Thu Jun 18 1998 - 14:10:48 BST