The following control characters embedded in an output string in PRINT and DISPLAY can be used to control behavior and effects of the display screen:
Output Area
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CHR$(7)
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Ring the bell
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CHR$(8)
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Move the print location back one space
|
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CHR$(10)
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Move the print location down one line
|
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CHR$(12)
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Print two line feeds, scroll the output area so that the next line is at the top of the output area
|
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CHR$(13)
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Move the print location to column one
|
Display Line
|
CHR$(12)
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Clears the DISP line
|
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CHR$(13)
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Moves the DISP line cursor to column one and clears the DISP line when the next character is sent to the DISP line
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Display Effects:
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CHR$(128)
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All effects off
|
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CHR$(129)
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Inverse video on
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CHR$(130)
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Blinking video on
|
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CHR$(131)
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Inverse and blinking video on
|
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CHR$(132)
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Underline mode on
|
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CHR$(133)
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Underline and Inverse video on
|
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CHR$(134)
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Underline and Blinking video on
|
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CHR$(135)
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Underline, Inverse, and Blinking video on
|
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CHR$(136)
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White
|
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CHR$(137)
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Red
|
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CHR$(138)
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Yellow
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CHR$(139)
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Green
|
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CHR$(140)
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Cyan
|
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CHR$(141)
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Blue
|
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CHR$(142)
|
Magenta
|
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CHR$(143)
|
Black
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Because some computers use character sets with character values that conflict with these characters, CONTROL CRT,100 moves these display effects control characters to the range CHR$(16) through CHR$(31).