Early 3.5" Floppy Drives

[Fred Cisin]

> >January 1986, PC-DOS 3.20 supported 720K 3.5".
> >Later in 1986, PC-DOS 3.30 supported 1.4M.
On Mon, 12 Dec 2005, Chuck Guzis wrote:
> 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.

Numerous machines came out with 3.5" drives using "customized" versions of
MS-DOS 2.11.

2.11 and 3.31 seem to be the primary versions of MS-DOS that were
customizable by OEMs.


The "official", "standardized" support of 3.5" 720K in 3.20 was with use
of DRIVER.SYS and/or DRIVPARM.  DRIVPARM was incompatible with IBM's BIOS,
and therefore was undocumented in PC-DOS.

--
Grumpy Ol' Fred     		cisin at xenosoft.com