Don Russell wrote:
Well, good luck with your SIO instructions there. ;-)

I said BC mode.. Never said Pre-XA ! (all I said is that a z/Arch PSW is no longer an EC mode PSW since the E bit in the PSW is 0 in z/Arch (lest you want an early Specification Exception to occur))

(However, some virtualization solutions with 370ACCOM will allow SIOs !)

--Ivan

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