IANALE, so wild speculation alert:

Emulation *might* be different--PSI kept saying they didn't do
emulation, although it quacked like a duck.

The AMD licensing might be slightly different, since their
architecture is slightly different.

But it's a great question! I'd love to know the answer.

P.S. "z/Architecture". Slash for software (and the architecture, oddly
enough, is considered software).

On Tue, Mar 24, 2009 at 12:36 PM, John McKown <[email protected]> wrote:
> I'm a bit curious. If I understand what is being done, it is similar to a
> Java JVM. The z/VOS reads and interprets the x86 arch instructions, with
> some JIT on the side. However, other companies, such as AMD, need cross
> licensing to create chips which run x86. That "cross licensing" is part of
> IBM's complaint against PSI. PSI was not licensed to create a zArchitecture
> emulator. Couldn't Intel "shut down" Mantissa with a similar suite? I don't
> remember reading that Mantissa has an agreement with Intel. I don't think
> the "fact" that z/VOS is a software emulator instead of a harware
> implementation is relevant. Of course, IANAL.

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