Floppy drive pin 2 question?
cctalk at randy482.com
Fri Mar 11 12:44:09 CST 2005
From: "Michael Sokolov" <msokolov at ivan.harhan.org>
Sent: Friday, March 11, 2005 12:25 PM
> Randy McLaughlin <cctalk at randy482.com> wrote:
> > I am 99.99% sure it changes the RPM, I have some TEAC 1.2's laying
> > I'll plug one in and ground pin 2 to check it.
> > For the TEAC it is enabled via an option jumper, default is to ignore
> Changing the RPM is an option on SOME drives, and for PeeCees to work it
> must be OFF. It is very useful for Classic Computers, though.
> The high density select signal (pin 2) may or may not switch RPM, but it
> always switches the write current. Writing on HD media with DD write
> will produce no effect (the field is too weak to affect the media), while
> writing on DD media with HD write current will magnetise the media so
> strongly that it'll be impossible to rewrite and unusable until you
> bulk-erase it. So pin 2 MUST always select the correct write current for
> the media type.
> 3.5" drives use the media type hole instead to select the correct write
> current. Those who punch or cover that hole to magically "change" the
> media type get what they deserve.
No, I have refered to the TEAC site and to WDC:
WDC referes to pin 2 as speed select, their controller can be used with
either single speed or dual speed 1.2mb drives:
TEAC specifically stated that pin 2 is default to ignore, the I strap is
used to enable speed change:
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