In a message dated 6/25/2008 9:17:49 A.M. Central Daylight Time, [EMAIL PROTECTED] writes: >... a number of linkage assist instructions that were never publicly by IBM documented to my knowledge. IBM documented the five mentioned by the OP in an extremely thin generally available publication in ca. 1983 or 1984 that was titled something like S/370/XA Processor Assist. I believe that this book was also the first public documentation on the (at that time) new Control Register bit that governs Low Address Protection. I had a copy of the book for a decade or two. I also vaguely recall that another pair of assist instructions were to set and remove an FRR. Bill Fairchild Rocket Software
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