-> AT&T.  I don't remember what year, but it was definitly AT&T and not
-> USR or Hayes or Rockwell.  And they made their improvment public
-> domain, so anybody could implement it. USR made their own
-> modifications to it, making their version proprietary and unable to
-> work with other V.32terbo modems,
No offense, but that simply isn't true.  USR's terbo is fully compatible
with AT&T's. USR does have a proprietary extension to 21.6K, but that
does not make it incompatible with the others.
By the way, terbo is most certainly _not_ in the "public domain".
Joe
--- FidoPCB v1.5 beta-'j'
---------------