On 6/26/2013 7:59 PM, David Riley wrote:
  Depending on your definition of "they", yes!
Specifically, the
 Living Computer Museum has both TOPS-10 and TOPS-20 running,
 accessible from the internet.  You can get an account today,
 even!  I'm really glad they're doing it.  There may be others,
 but they're hard to find. 
I found that site, but the cannot find a link for that yet.
  - Dave
 
Ben.