Dynapro Technologies Dynapro ET TCS, Application Developer'S Manual

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The color TCS has eight basic colors programmed in Read-Only Memory (ROM): black, red,
green, yellow, blue, magenta, cyan, and white.
For each character on the display, the foreground color and background color can be
programmed independently. The character colors are handled like any other character attributes,
except they can be selected locally from the Setup Screen, as well as remotely with the Set
Command Attributes command. For details see Character Interpretation Commands, Chapter 5.
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Many TCS commands cause characters to be displayed or erased. Normally, the color TCS
displays each character’s foreground and background in the currently selected colors. When
characters are erased, each erased character is replaced by a space character in the current
background color. However, the color TCS has several controls that provide much flexibility
over when and how foreground and background colors are actually used. These capabilities are
summarized in the following paragraphs.
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Each of the eight basic colors has an associated highlight color which is generally a lighter or
brighter version of the basic color. When the highlight attribute is selected, using the Set
Character Attributes command, the highlight color is sustained for the currently programmed
foreground color.
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The TCS has two controls that cause the selected foreground and background colors to reverse
positions: Screen Background Mode and the reverse-video character attribute.
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The Screen Background Mode command controls the foreground/background color
relationship for the entire TCS display. While this mode is reset, normal video is in effect,
while it is set, reverse-video is in effect. The Screen Background Mode command can be
issued locally or remotely. Refer to Screen Appearance Commands in Section 5.
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The reverse-video character attribute is a parameter of the Set Character Attributes
command. For each character with this attribute selected, the foreground color replaces the
background color and the background color replaces the foreground color.
These two controls interact such that when the Screen Background Mode is set and the reverse-
video attribute is selected for a given character, the character is displayed with normal
foreground/background color relationship.