On Tue, 13 Jul 2010 10:17:30 -0400, Scott Rowe wrote:

>If you are at z/OS 1.7 or higher you are quite certainly running in 64-bit
mode, 

z/OS 1.6 requires z/Architecture.

z/OS 1.5 can only run in z/Architecture mode on a z/Architecture 
capable processor.  It can run in ESA mode only on G5 or G6.

z/OS 1.1 through 1.4 can run in ESA mode on z/Architecture hardware 
only with a special offering for a limited length of time.

-- 
Tom Marchant

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