On 9/14/2010 8:26 AM, McKown, John wrote:
Sure. Why not. I use them for 64 bit numbers where I used to use a register pair. Can OS/390 run on z hardware? I don't remember anymore. But use of Grande registers in application code cannot be stopped by the OS. Of course, if you call other routines, you'd better store them yourself. Because somebody else might be doing the same.
OS/390 V2R10 was the first release to support machines with z/Architecture. All prior releases will run only in ESA/390 mode. In that mode, the high halves don't exist.
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