Alan, I think I'm remembering that z/OS will only use so many bits of that hardware addressing capability for the time being. It's been a while since the announcements, and we never really got any education on it. :( Or perhaps Neale's right, and I'm thinking of the zLinux implementation.
Mark -----Original Message----- From: Alan Altmark [mailto:[EMAIL PROTECTED]] Sent: Friday, February 14, 2003 1:27 PM To: [EMAIL PROTECTED] Subject: Re: IBM stops Linux Itanium effort On Friday, 02/14/2003 at 12:56 EST, "Post, Mark K" <[EMAIL PROTECTED]> wrote: > The current zSeries systems are not 64-bit addressing machines. They are > 46- (48?-) bit addressing machines. So, once again, the word size is larger > than the addressing size. I just hope IBM and everyone else learned their > lesson from MVS/XA, and don't treat the "unused" high order bits to mean > "special" things that get a lot of code built around them. Say, what? z/Architecture machines have 64-bit addressing. It says right in the Principles of Operation that it can address 16E (16*2**60 == 2**64) bytes. Putting junk in the high-order bits will get you in trouble right away. Alan Altmark Sr. Software Engineer IBM z/VM Development
