Peter Relson writes 
> Similar processing occurs if you have an FRR. If you are not legally
> disabled, RTM will give control to your FRR enabled (it does not
matter if
> the FRR is set before or after you illegally disable).
> SETFRR ...
> STNSM -- now disabled
> blow up -- still disabled
> FRR entry -- enabled

Peter, this is at odds with the description of the environment on entry
to an FRR in the Authorized Asm Programming Guide. 

"Interrupt Status: An FRR gets control and is entered disabled if, at
the time of the error, the mainline is disabled. Any FRR entered
disabled must remain disabled."

See <http://preview.tinyurl.com/2bcwhr> 

The description in the book does seem consistent with what I have
observed. I am quite prepared to believe you're right, but if so the
book is wrong and ought to be corrected. 

CC

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