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One of our customers brought to our attention an example of a flat file that used Hex 1C as a delimiter.

I'd never heard of Hex 1C (asterisk with overscore) being used in any other context than the "Dup" key (shift-insert) on a terminal, but a bit of research turned up references to "Field Mark" (which sounds like some kind of delimiter), and to Shift-Home on 3270 terminals being mapped to that value. I tried that keystroke on our 3489, and to my surprise, I got an error of "Duplicate key or Field Mark key not allowed in field." I tried it again in a field that I knew accepted a "Dup" keystroke, and while I had no trouble getting "Dup" accepted, "Shift-Home" produced the same message.

Does anybody here know what a "Field Mark" is, or why it shares the same hex value and glyph as "Dup," or what kind of field actually does accept it in 5250 data stream?


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