13 Dec
2005
13 Dec
'05
2:05 a.m.
On Mon, 12 Dec 2005 13:42:04 -0800 (PST)
Fred Cisin <cisin at xenosoft.com> wrote:
I installed a drivparm line in the config.sys file of a true-blue
IBM PC-XT just this morning with good results. However, it is a
machine with a BIOS extension on the controller card. And it's
running MS-DOS.
>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.