Peter Flass wrote: > James J. Weinkam wrote: > >>> >> Unfortunately, I no longer have any S/360 manuals and there don't seem >> to be any free downloadable versions. > > > http://www.bitsavers.org/pdf/ibm/360/poo/A22-6821-6_360PrincOpsJan67.pdf > http://www.bitsavers.org/pdf/ibm/360/poo/A22-6821-7_360PrincOpsDec67.pdf > Thanks for this reference. A22-6831-7 gives substantially the same description of HALVE as the 370 manual I quoted earlier. Apparently by 1967 they had got it right on the 360.