1 Feb
2009
1 Feb
'09
6:37 p.m.
would this in any way to be related to the IBM PC 'ED' disks?
the 2.1MB floppies that were out for a while?
I have some floppies of that format, not totally sure if I still have the drive though.
Dan.
From: cclist at sydex.com
To: cctalk at classiccmp.org
Date: Sun, 1 Feb 2009 10:28:11 -0800
Subject: Re: 720RPM 3.5" FDDs?
On 1 Feb 2009 at 13:24, Christian Corti wrote:
_________________________________________________________________
How fun is this? IMing with Windows Live Messenger just got better.
http://www.microsoft.com/windows/windowslive/messenger.aspx
While looking at datasheets of 3.5" floppy
drive motor control ICs, the
LB1813 apparently supports four different speeds "out of the box". Pins 15
and 16 are used to select 300, 360, 600 or 720 RPM. So, I know 3.5" drives
with one of the first three speeds, but has anyone ever seen a 720 RPM
drive? A drive with that IC would be the very common Mitsumi D359.
I've never seen one, but it's logical to suppose that a double-speed
drive that handles 1.3MB media has been made. I'd expect to find it
in Japan moreso than the West, however, since the Japanese used to be
pretty much wedded to the NEC 9801 series archtecture that used 360
RPM drives for everything.
Cheers,
Chuck