>--------------------------<unsnip>-------------------
>George, the device doesn't need to be online or available. By adding the 
>VIO=YES parameter, you are telling the system which type of device to 
>emulate for a UNIT=VIO request. This defines the geometry of the 
>emulated device, so the various access methods using it are "device 
>aware" and the I/O Supervisor routines responsible can make any 
>device-dependant decisions. It's way of saying the "VIO = 3390 geometry".

That's kind of what I thought.  Thanks for all of your help!

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