On 2014-11-05, at 05:10, Tony Thigpen wrote: > And z/VSE followed the same pattern as z/OS. > > And, as a little extra, this is why the 31/64 line is called a BAR, not a > LINE. The unusable addresses are what is in the BAR. So, you can be above the > bar, or below the bar, but not in the bar. (No drinking allowed. :-) ) > This been discussed, tediously, in these lists. The statement, including from some IBM employees, perhaps unofficial, is that the BAR is an infinitesimal boundary immediately below 2GiB. Any address >= 2GiB is considered *above*, never in, the BAR.
Nevertheless, as long as z/OS and z/VSE exclude 2GiB <= address < 4GiB, I prefer your interpretation. Is "bar" prevalent in VM or Linux argot? -- gil
