On Wed, 27 Nov 2019 17:26:35 +0000, Seymour J Metz wrote: >TSS/360 used an explicit length at offset -4 from the parameter list, so the >end-of-list bit wasn't an issue.
>The addresses transition from 7FFFFFFF_FFFFFFFF to 80000000_00000000 is a z/OS >issue rather than an architectural issue. I beg to differ with respect to the need for care when using BXHG and BXLEG. Because the values are treated as signed 64-bit integers for the purposes of addition and comparison, the transition from the maximum positive number to the maximum negative number can cause an issue regardless of operating system. -- Tom Marchant
