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From: wtm@neoucom.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Reading MacDisks on Amiga
Message-ID: <583@neoucom.UUCP>
Date: Wed, 13-May-87 11:59:05 EDT
Article-I.D.: neoucom.583
Posted: Wed May 13 11:59:05 1987
Date-Received: Sat, 16-May-87 05:00:33 EDT
References: <8705080543.AA18112@cory.Berkeley.EDU> <112@l5comp.UUCP> <3038@well.UUCP>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 17
Summary: Some/all Amigas will not permit drive speed change


I don't know about the Panasonic drives, but the NEC drives
definitely DO NOT have any means for having the processor alter the
rotational speed.  The NEC drives have a small, in fact *very*
small pot on the bottom circuit board in front next to the flywheel
that can be used to tweak the speed.  Note that the pot is normally
of no benefit to the end user.  I've heard that the rpm of the
Panasonic drives is crystal controlled, and thus not adjustable at
all.

Perhaps, an industrious programmer could rapidly select and
de-select the drive motor to implement virtual speed control via
pulse width modulation.  The speed would vary depending on the
floppy, however.  I guess you'd have to stay awary from those
sticky made in USA black disks (grin).

   --Bill (wtm@neoucom.UUCP)