Strings tells me it’s from Venturcom

 

“VENTURCOM INC.  1981, 1982”

 

Maybe these guys?

 

https://www.businesswire.com/news/home/20041111005095/en/VenturCom-Launches-Enhanced-RTX-Version-6.0

 

“IntervalZero’s experience and expertise in embedded technology extends back to 1980 with the founding of its predecessor company, VenturCom, which developed the technology that led to Microsoft’s first embedded operating system.”