On Thu, 13 Sep 2012 18:10:01 +0000, David Stokes wrote: >In z/OS 64 bit storage is just a sort of data cache really.
No, it isn't, but it can be used that way. >Programs that use it have to be specially written, Of course they do. That's because new instructions must be used to manipulate the registers required to address the data. It was designed that way for compatibility with old code. >it's not a (more or less) transparent thing like in Windows >(just recompile with the 64 bit option!) Is that true of assembler programs in Windows? If your programs are in C/C++, you can do that in z/Architecture too. -- Tom Marchant
