Re: 800K drive on an iMac?

[Dennis Jenkins <dennis@usb.com>]

Where can I find a detailed description of this encoding scheme
(online)?  I remember reading about it in a book that had a full
dis-assembly of Apple Dos 3.3.  Unfortunately, I did not own the book,
and the last time I saw it was 1992.

Simon Biber wrote:
> 
> > The 1.4mb 720k pc disks are MFM while the 800k ProDOS & Mac disks are GRC.
> > Even ignoring that, Apple used a variable speed drive to get 800k on the
> floppy while
> > 720k & 1.4mb disks are written on a single speed drive.
> 
> GRC? GCR.

-- 
dennis@usb.com                           Universal Savings Bank.

The three most dangerous things are a programmer with a soldering
iron, a manager who codes, and a user who gets ideas.