4.2.4 Interaction of Ruled Lines and Other DECterm Escape Sequences

4.2.4 Interaction of Ruled Lines and Other DECterm Escape Sequences

Table 4-18 describes the effect of using standard DECterm escape sequences when ruled lines are drawn on the screen.

Table 4-18: Behavior of Standard Escape Sequences with Ruled Lines

Mnemonic	Description	Effect on Ruled Lines
DECDWL, DECDHLT, DECDHLB	Display as double width or double height	These escape sequences have no effect on ruled lines, whose width is always one pixel. Furthermore, the parameter units for the escape sequences controlling ruled line display are always specified in terms of single width and single height columns and rows, even when the escape sequences are used with those that double the height and width of text.
GSM	Modify graphic size	These escape sequences have no effect on ruled lines, whose width is always one pixel. Comments made in the entry for DECDWL, DECDHLT, and DECDHLB also apply to GSM.
ED, EL, ECH	Erase display, erase line, and erase character	These escape sequences do not erase ruled lines, only the characters within the boundaries of the ruled lines. For example: +------+------+ +------+------+ \|ABCDEF\|abcdef\| \| \| \| +------+------+ --> +------+------+ \|123456\|123456\| \| \| \| +------+------+ +------+------+
DL	Delete line	This escape sequence erases both lines of characters and ruled lines at the active position of deletion. The text lines and accompanying ruled lines that follow the deletion point are scrolled up. For example: +------+------+ +------+------+ \|ABCDEF\|abcdef\| \|123456\|123456\| +------+------+ --> +------+------+ \|123456\|123456\| +------+------+
IL	Insert line	This escape sequence causes insertion of blank lines at the active position. It causes both text and accompanying ruled lines currently at the active position to be scrolled down. For example: +------+------+ \|ABCDEF\|abcdef\| +------+------+ --> +------+------+ \|123456\|123456\| \|ABCDEF\|abcdef\| +------+------+ +------+------+ \|123456\|123456\| +------+------+
DCH	Delete character	This escape sequence does not delete ruled lines. The following example shows the result of deleting four characters at the third column position: +------+------+ +------+------+ \|ABCDEF\|abcdef\| \|ABabcd\|ef \| +------+------+ --> +------+------+ \|123456\|123456\| \|123456\|123456\| +------+------+ +------+------+
ICH	Insert character	This escape sequence causes blank spaces to be inserted at the active position but has no effect on ruled lines. The following example shows the result of inserting four characters at the third column position: +------+------+ +------+------+ \|ABCDEF\|abcdef\| \|AB \|CDEFab\|cdef +------+------+ --> +------+------+ \|123456\|123456\| \|123456\|123456\| +------+------+ +------+------+
IRM	Invoke insert/replace mode	Insert/replace mode has no effect on ruled lines. The following example shows the result of inserting the characters w, x, y, and z at the third column position and replacing the character f with s: +------+------+ +------+------+ \|ABCDEF\|abcdef\| \|ABwxyz\|CDEFab\|cdes +------+------+ --> +------+------+ \|123456\|123456\| \|123456\|123456\| +------+------+ +------+------+
DECCOLM	Invoke column mode	Ruled lines are erased with accompanying text when column mode is in effect.
RIS, DECSTR	Reset to initial state and soft terminal, invoke reset SETUP mode	The RIS sequence erases all ruled lines displayed on the screen while the DECSTR sequence does not. Note that the Clear Display option on the DECterm Commands menu erases all ruled lines whereas the Reset Terminal option does not.