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James,
 
> I don't know if this is useful to you, but x5250 can be compiled to put an
> '@' on the screen everytime it encounters a display attribute.  This way
> you could check to see if the attribute is there or not.

There are times I found the old Test Mode switch on the front of the
5251-11 useful, as it would give the exact hex contents of each
attribute byte plus show the difference betweeen blanks and nulls.

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