Dynapro Technologies Dynapro ET TCS, Application Developer'S Manual

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For the color TCS, when nochange attribute mode is reset, commands that erase characters turn
off the highlight, underline, blink, reverse-video, and concealed attributes and fill the erased area
using the currently selected color attributes. When nochange attribute mode is set, these
commands function exactly as they do on the monochrome TCS.
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1) Suppose the operator frequently needs to work some distance from the TCS and could not
easily see normal characters. The following technique could be used to make the display
readable at greater distances.
a) The host sets each line in the scrolling region to be a double-wide line.
b) Then, the host sets the NOCHANGE Attribute Mode.
c) From this point on, the TCS displays all incoming characters in double-wide format with
no further action required by the host. If this technique is used, the host should be sure to
send lines no longer than 40 characters (or set the Auto-Wrap Mode) to ensure that all
characters are visible.
d) The entire scrolling region retains its double-wide line attributes as new characters
arrive, even with the display scrolling
2) The following sequence illustrates another typical use of the NOCHANGE Attribute Mode:
a) The host sends the Set Character Attributes command to select highlighted characters,
then sends the message, "WARNING. . . HEAT RISING." The message is displayed in
highlighted characters.
b) The host sends the Set Character Attributes command to select new character attributes
(for example, normal attributes), then sends a less important message for display
elsewhere on the screen, using the new attributes.
c) The host sets the NOCHANGE Attribute Mode.