The MicroFocus documentation in https://supportline.microfocus.com/documentation/books/oc41books/fhform.htm, in section 188.8.131.52, says that line sequential files "correspond to simple text files as produced by the standard editor provided with your operating system".
I've created a line-sequential file whose records are PIC S9(12) OCCURS 1600. When I look at the output in Notepad, I see that the number -999999999999 appears to be stored as 99999999999y.
Do I need to change my organization from "line sequential" to "sequential", or can a program reading that line-sequential file actually convert the 99999999999y back to -999999999999 ???