On Mon, 28 Aug 2006 14:13:28 -0400, Alan Altmark <[EMAIL PROTECTED]> 
wrote:

>It depends on your definition of of "operating system".  The classical
>definition is the chunk of software that manages the real system
>resources, allocating them to application programs.  That is, the
>gatekeeper for access to the CPU, memory, and I/O devices.  That would be,
>again classically, just BCP: the thing that holds the SVCs.
>
With that definition, I think you still need to include a *lot* more.  
Access to I/O devices would seem to require DFSMS, TCP/IP, VTAM, JES and 
RACF if you include DASD, terminals and printers.

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