The rumor back in the 80's was that they had reverse engineered the FACOM's 
 from SYS1.MACLIB. I know they made it to XA 'cause several 3rd party 
vendors  were routed thru SFO on their way over. Think Bruce Black(FDR) and 
others  mentioned they got most of it right with the exception of a few 
interrupt 
 stacks. 
 
http://www.fujitsu.com/global/about/corporate/history/1980-1991/
 
When Dr. Merrill wakes up he can probably shed more light. There's several  
Fujitsus member in MXG.
 
 
In a message dated 2/23/2017 1:31:41 A.M. Central Standard Time,  
dbajava...@gmail.com writes:

How  different is Fujitsu operating system compared with z/OS ?

Just heard  about Fujitsu Mainframe so was little curious about  its
architecture.


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