[COLUG] first Unix with demand-paged virtual memory

[jep200404]

Is the claim that the AT&T PC 7300 (aka UNIX-PC aka 3B1) had the first 
Unix with demand-paged virtual memory? It seems hard to believe. 

In http://www.linuxjournal.com/node/1005754, I see the following: 

   Let's not forget the first Unix with demand-paged virtual memory: 
   the AT&T PC 7300 (or UNIXPC). It had 1MB RAM, 4MB virtual memory, 
   10 MHz 68010, SysVR3, loadable drivers, and email, among other things. 
   It even had primitive windowing.