On 16-Feb-16 06:49, Johnny Billquist wrote: > More precisely, V7.3 will run on *any* VAX, including the primal >> VAX-11/780. This level of backwards compatibility is unique. > > No, it is not. Talk to IBM about S/360... :-) Agree > And there are some VAXen on which V7.3 will definitely not run. How > about rtVAX for example. Not fair. No version of VMS ever ran on rtVAX - it was designed that way. (For yes, marketing reasons.)
Any version of VAX/ELN should run on all previous rtVAXen. For those who don't know, rtVAX is used in the Realtime market. VAX/ELN is the OS used with it. Another Cutler OS - written largely in PASCAL. You build an image on VMS, where it's a layered product. Then deploy to your embedded system, often with a MOP boot. (Yes, another protocol that wireless usually doesn't route.) It is exactly a VAX, except that process page tables are in physical, rather than virtual memory. The difference is that the process base register contains a physical address, and microcode can omit the virtual -> physical translation on a TB refill. This was sold as a performance optimization for Realtime. It was - but it wasn't strictly necessary. It really allowed market differentiation; rtVAX could be sold in embedded systems at an affordable (for the time) price point without cannibalizing the minicomputer/data center machine pricing. (Former DEC Realtime and VAX architect. And no, not responsible for this decision.)
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