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On Thu, 9 Feb 2006, Simon Coulter wrote:
midrange.com
Does anyone know what Field Control Word (FCW) x'8100' means? I can't
find it described in any of:
o 5250 Information Display System Functions Reference Manual
o 5494 Functions Reference manual
o Dynamic Screen Manager APIs
Even though it appears undocumented I have seen it in the 5250 data
stream Start of Field Order for Word Wrap fields that are sent to a
device which has indicated it cannot support Word Wrap. Here is a trace
of the data stream. Notice the 8100 FCW for the first two fields after
the 4020 FFW? If the device does indicate it can support Word Wrap the
8100 FCW is replaced with 8680 which is what I would expect.
I went into the source for lib5250 and looked over the code that handles field control word and field format word. The code doesn't have anything for 8100, though 8101, 8102, 8103, and 8106 are all handled.
I once came across a similar mystery that may be useful here. I onceencountered an undocumented code in the 5250 data stream returned by iSeries Access. I talked to IBM about it and they said it was a leftover from code that was used to talk with mainframes that somehow snuck into iSeries Access. The docs said that this particular area of the 5250 protocol was supposed to be reserved and all zeros, but iA was sending hex 40 or something. The end result was "just ignore it".
James Rich
It's not the software that's free; it's you.
- billyskank on Groklaw
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