In a message dated 11/28/2007 10:23:36 A.M. Central Standard Time, [EMAIL PROTECTED] writes: >IIRC, FLIH effectively ended when enough status was saved that ANY other interrupt would not lead to a data loss such that the original interrupt couldn't be processed correctly. Emphasis seemed to be on the chance of a timer "pop". Timer "pops" can be disabled in the new PSW's system mask when the PSW is swapped and the FLIH starts to run. But you cannot mask off restart, machine, or program interrupts. All FLIHs must be able to withstand being interrupted by such events. SVC interrupts are effectively masked off by not coding any in the FLIH. Bill Fairchild Franklin, TN
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