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On Tue, 2 Mar 2010, dale janus wrote:

I would just like to confirm that there is still no way to display a
field in yellow or turquoise without also displaying column separators.
We are running out of highlight colors and want to use yellow, but we
get column separators. Blue has no column separators, but it is too dark.

Column separators are simply a hex code at the beginning of the field in the 5250 protocol. The 5250 terminal (or, usually, the emulator) adds the actual column separators when it receives that hex code. Some emulators can be configured to not add the column separators.

A little explanation: originally, there were no colour codes. There were codes for normal, reverse image, blink, underline, highlight, and column separator. Later on colour codes were added. Due to the design of the 5250 protocol, there weren't enough codes to go around to uniquely specify all colours and all other attributes. So red and blink are actually the same code, as are yellow and column separators. On a colour display, blink is interpreted as red (and it also blinks) and column separators are interpreted as yellow (with the separators).

I understand if I am using client access, I can change the column
separator color to black to match the background color and it will
disappear. This may be an option for us.

Or use an emulator that disables them completely and simply treats column separators as just plain yellow. x5250 comes to mind... (I wrote it)

But I remember years ago, in another lifetime, on the Sys36, I could
flip a bit on the first character of the field (and flip it back at the
end) and it would display in color. I used this to set color on a
display array, in the days before we had subfiles.

Does anyone know if this technique will remove the column separator? Or
will I just spend a lot of time bit twiddling and still get yellow or
turquoise with column separators?

See discussion above for why this won't work. The colour yellow always includes the code for column separators.

James Rich

if you want to understand why that is, there are many good books on
the design of operating systems. please pass them along to redmond
when you're done reading them :)
- Paul Davis on ardour-dev

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