From: mblack@pubnix.net   
      
   On Sat, 25 Aug 2018, neilsmorr@gmail.com wrote:   
      
   > On Saturday, August 25, 2018 at 5:18:41 PM UTC-7, Michael Black wrote:   
   >   
   >> The Radio Shack Color COmputer started with single sided floppies, and   
   >> maybe 35 tracks per disc.  Surely older Radio Shack systems did too.  And   
   >> then later there were third party improvements.  I have some odd disks for   
   >> the CoCo becasue when I bought a floppy drive, it was from a third party,   
   >> with a ROM that allowed double sided operation, but in an odd fashion.   
   >> Later iterations didn't do things that way.   
   >>   
   >> So if the firmware allows for only 35 tracks, and/or single sided, but the   
   >> floppy is 40 tracks and/or double sided, an older arrangement can't copy   
   >> that "newer" floppy.   
   >>   
   >>   Michael   
   >   
   > IIRC, the Coco formats the floppy with too small a starting gap on the   
   > tracks. Formatting them on the PC fixed that.   
   >   
   Now that you mention it, wasn't there an incompatibility between the   
   floppy controller IC used in the "IBM PC" and the controller IC used in   
   the CoCo's floppy controller?  I'd forgotten about that until your reply,   
   I just rmemember some vague issue mentioned in Rainbow.   
      
      Michael   
      
   > I needed it, because I needed to read the disks on the PC for an   
   > emulator and for transfer to the internet etc.   
   >   
      
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