DECSERA—Selective Erase Rectangular Area

This control function erases all erasable characters from a specified rectangular area in page memory. The select character protection attribute (DECSCA) control function defines whether or not DECSERA can erase characters.

When an area is erased, DECSERA replaces character positions with the space character (2/0). DECSERA does not change:

Available in: VT Level 4 mode only

Format

CSI
9/11
Pt
3/n
;
3/11
Pl
3/n
;
3/11
Pb
3/n
;
3/11
Pr
3/n
$
2/4
{
7/11

Parameters

Pt, Pl, Pb, and Pr
define the rectangular area to be selectively erased:

Pt is the top-line border. Pt must be less than or equal to Pb.
Default: Pt = 1.

Pl is the left-column border. Pl must be less than or equal to Pr.
Default: Pl = 1.

Pb is the bottom-line border.
Default: Pb = the last line of the active page.

Pr is the right-column border.
Default: Pr = the last column of the active page.

Notes on DECSERA