IBM Mainframe Discussion List <[email protected]> wrote on 07/07/2005 
12:12:19 PM:

> And I am  very curious as to how
> IBM managed 
> to make z/OS work with more than 16  Instruction Processors in one 
image. 
> E.g., how is the 17th CPU supported  with the 16-bit CPU affinity 
> mask in the SRB 
> and all the other various 16-bit  CPU masks imbedded at least in the 
Control 
> Program?

 z/OS does not allow SRB or TCB affinity to any processor whose address is
larger than x'0F'.  The affinity 16-bit masks were not extended.  Some of 
the
other 16-bit masks (in IHACSD, for example) were replaced by new (longer)
bit masks. 

Jim Mulder   z/OS System Test   IBM Corp.  Poughkeepsie,  NY

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