[Info-vax] OpenVMS I64 V8.1 "Evaluation Release"?

[Nomen Nescio]

Johnny Billquist <bqt at softjar.se> wrote:

> All claims for maximum physical memory on all machines I've seen so far 
> are way below any 2^64 address range, and for some I have managed to 
> find definitive information. The one I totally failed on was the z196. 
> I'll totally agree that it's only conjecture, but based on the 
> information I have managed to find, it looks like the max would be 64 
> GB. That is way, way from 2^64...

Somebody said 3T but yeah, a very very long way to 2^64.

And I remember when 16K sounded so huge...

> It would be interesting to hear if anyone with deep knowledge about the 
> architecture could comment on what the theoretical limits are on how 
> large physical addresses can be formed.

IBM is real proprietary about all the mainframe stuff. Most of us who
learned it were around when they were a little more helpful but it still
took a lot of digging. Most of the physical specifications and details are
only known to companies like Fujitsu when they spend millions of dollars
sawing open IBM boxes so they can rip them off. The Japanese guys probably
know more about what IBM is doing than any of us.