Indicates if the I/O sub-system in the device is not
ready. If there are no items in the collection (i.e. no
bits are set), then the I/O sub-system is ready. If
there is an item present, then the item indicates what
is causing the I/O sub-system to be not ready. If the
I/O sub-system is not ready due to a soft error, the
soft error is considered to be an auto-continuable
error, thus it can be acknowledged by setting the
CONTINUE object to eTrue.