Early 3.5" Floppy Drives

[Scott Stevens]

On Mon, 12 Dec 2005 13:17:53 -0800
"Chuck Guzis" <cclist at sydex.com> wrote:

> On 12/12/2005 at 12:50 PM Fred Cisin wrote:
> 
> >January 1986, PC-DOS 3.20 supported 720K 3.5".
> >Later in 1986, PC-DOS 3.30 supported 1.4M.
> 
> The 720K 3.5" drive was introduced by IBM in 1986 as an option
> for the standard PC-PC/AT product line.  What I recall about the
> PS/2 was the support for DSHD and DSED 3.5 diskettes.  In fact,
> drivers had been available earlier than PC-DOS 3.2 from third
> parties for 720K 3.5" drives.
> 
> Cheers,
> Chuck
> 
> 

The IBM PC-Convertible exclusively uses 720K 3-1/2" diskettes. 
And the face of the Convertible floppy drives have the appearance
(for an Apple machine, they call it 'trade dress') of the PS/2
line.  It's a real shame the Convertible doesn't support 1.44M
floppies, like the Toshiba 1000sx.  That would make it a much more
current and usable machine.