David Wilson wrote:
> On Feb 5, 11:56 am, "Charlie"  wrote:
>>  Its just that nothing I've ever read from
>> Apple gives any indication that the rotational speed of the drive can be
>> controlled from outside the drive.
> 
> The original 400KB Mac 3.5" drives had their speed controlled by the
> Macintosh. AFAIK, the 800KB drives ignore the speed signal on pin 10
> of the 19 pin connector. On the Apple IIc and IIgs this pin is used as
> the Write Protect signal.
> 
> See http://support.apple.com/kb/TA48050?viewlocale=en_US for pinout
> and signal descriptions.

So only a special AE 800KB floppy could have its zone speed changes
overridden by software or the disk controller...

-michael

******** Note new website URL ********

NadaNet and AppleCrate II for Apple II parallel computing!
Home page:  http://home.comcast.net/~mjmahon/

"The wastebasket is our most important design
tool--and it's seriously underused."
--- SBBSecho 2.12-Win32