On Thu, 11 Dec 2003 13:11:54 -0600, you wrote: >To clarify a little, s390 has a 31-bit (2 GB) address space, but it is >otherwise a "normal" 32-bit environment. Yes, the 32nd Bit is used to signal betweens 31 bit and 24 bit addresses. Best Regards: Jochen Schmitt