Patrick O'Keefe wrote:
That being said, I have no idea what happens if the USS data is an extended datastream. VTAM and Tn3270 servers probably send it. If the receiver processes it without first being told it should, then everything probably works.
Modern (emulated) 3270 devices generally tell the PLU that they can handle extended color orders via the response to Read-Partition Query. That tells the PLU such orders will not be rejected by the SLU.
I do not believe the SLU will ever reject an attribute with extended color prior to the query exchange. The device accepts what it accepts at all times. The query response simply tells the host side that it's OK to send such orders.
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