Floppy drive pin 2 question?

Randy McLaughlin cctalk at randy482.com
Thu Mar 10 19:57:00 CST 2005

From: "Pete Turnbull" <pete at dunnington.u-net.com>
Sent: Thursday, March 10, 2005 5:29 PM
> On Mar 10 2005, 20:33, Jules Richardson wrote:
>> Just futzing around with this Manta board (SCSI floppy controller).
>>  The docs I have say that pin 2 of the floppy connector is normally
> an
>> input to the controller from the drive, but that some drives expect
> pin
>> 2 to be an output to the drive from the controller (e.g. for changing
>> rotation speed on a drive capable of 300 and 360rpm)
>> That sounds wrong to me; surely most drives either don't use pin 2
> for
>> anything, or they expect it to be an output from the controller (to
> cope
>> with things like speed changes)
> Yes, but I believe some drives did use pin 2 to signal the controller
> in some way.  I've never (knowingly) come across one, but I'm told some
> Apple drives did this.
> -- 
> Pete Peter Turnbull
> Network Manager
> University of York

I have a webpage on disks and disk drives, I mention the Apple but that 
about it.

My page is 99% SA400 & SA800 based interfaces.

For other disk drives only the FM & MFM discussions may apply.


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