I found an 8-inch floppy disk labeled with "CP/M
V2.0 9/4/79" which
 is crossed out and replaced below with "CP/M V2.1 7/13/80".  I don't
 see mention of version 2.1 at 
http://www.cpm.z80.de.  Do I have
 something unique?  Who can I trust to image this and put the contents
 on the net? 
DRI released several updates to 2.0 to OEMs.  I think I still have the
update bulletins somewhere.  I don't know if I still have the code
itself.  It was a comparatively short period before 2.2 was released.
I don't recall if the result was 'officially" called 2.1 or not.
--Chuck