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The distant fog of my brain suggests to me that the "A" was for Add-only and was seen as only moving the file's end-marker.

The "U"pdate allowed update, and add. There was no concept of an indexed and keyed file at that time so there was no such thing as an insert. Why would there be, since there was no random access.

(fwiw, it was mentioned that you can use AS400's RPG in the Sys36 environment. Its hard for me to believe that there is any 1970s hardware still in use. Working with a more modern compiler would make any work in that system a whole lot easier, plus give much better performance.)


On 7/30/2016 4:38 PM, CRPence wrote:
...Apparently the designation (Desig=S) as secondary file along with File
Addition (Add=A) on the F-spec is not compatible; msg QRG2174
"File-Addition entry of A invalid." And that invalidate the ADD in
positions 16-18 of the O-spec; ...

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